Rebirth in Buddhism refers to the teaching that the actions of a sentient being lead to a new existence after death, in an endless cycle called saṃsāra. This cycle is considered to be dukkha, unsatisfactory and painful. The cycle stops only if Nirvana (liberation) is achieved by insight and the extinguishing of craving. Rebirth is one of the foundational doctrines of Buddhism, along with karma and Nirvana. Rebirth was a key teaching of early Buddhism along with the doctrine of karma (which it shared with early Indian religions like Jainism).Bhikkhu Anālayo (2018), Rebirth in Early Buddhism and Current Research, pp. 1–25. Somerville, MA, USA: Wisdom Publications. Gombrich, Richard (2009), What the Buddha thought, pp. 73–74. Equinox. In Early Buddhist Sources, the Buddha claims to have knowledge of his many past lives.Bhikkhu Anālayo (2018), Rebirth in Early Buddhism and Current Research, pp. 18–20. Somerville, MA, USA: Wisdom Publications. Rebirth and other concepts of the afterlife have been interpreted in different ways by different Buddhist traditions.

The rebirth doctrine, sometimes referred to as reincarnation or transmigration, asserts that rebirth takes place in one of the six realms of samsara, the realms of gods, demi-gods, humans, the animal realm, the ghost realm and hell realms. Rebirth, as stated by various Buddhist traditions, is determined by karma, with good realms favored by kusala karma (good or skillful karma), while a rebirth in evil realms is a consequence of akusala karma (bad or unskillful karma). While nirvana is the ultimate goal of Buddhist teaching, much of traditional Buddhist practice has been centered on gaining merit and merit transfer, whereby one gains rebirth in the good realms and avoids rebirth in the evil realms.

The rebirth doctrine has been a subject of scholarly studies within Buddhism since ancient times, particularly in reconciling the rebirth doctrine with its anti-essentialist anatman (not-self) doctrine. The various Buddhist traditions throughout history have disagreed on what it is in a person that is reborn, as well as how quickly the rebirth occurs after each death.

Some Buddhist traditions assert that vijñana (consciousness), though constantly changing, exists as a continuum or stream (santana) and is what undergoes rebirth."Post-Classical Developments in the Concepts of Karma and Rebirth in Theravada Buddhism." by Bruce Matthews. in Karma and Rebirth: Post-Classical Developments State Univ of New York Press: 1986 pg 125;Collins, Steven. Selfless persons: imagery and thought in Theravāda Buddhism Cambridge University Press, 1990. pg 215 Some traditions like Theravada assert that rebirth occurs immediately and that no "thing" (not even consciousness) moves across lives to be reborn (though there is a causal link, like when a seal is imprinted on wax). Other Buddhist traditions such as Tibetan Buddhism posit an interim existence (bardo) between death and rebirth, which may last as long as 49 days. This belief drives Tibetan funerary rituals. A now defunct Buddhist tradition called Pudgalavada asserted there was an inexpressible personal entity (pudgala) which migrates from one life to another.

Buddhist terminology and doctrine There is no word corresponding exactly to the English terms "rebirth", "metempsychosis", "transmigration" or "reincarnation" in the traditional Buddhist languages of Pāli and Sanskrit. Rebirth is referred to by various terms, representing an essential step in the endless cycle of samsara, terms such as "re-becoming" or "becoming again" (Sanskrit: punarbhava, Pali: punabbhava), re-born (punarjanman), re-death (punarmrityu), or sometimes just "becoming" (Pali/Sanskrit: bhava), while the state one is born into, the individual process of being born or coming into the world in any way, is referred to simply as "birth" (Pali/Sanskrit: jāti). The entire universal process of beings being reborn again and again is called "wandering about" (Pali/Sanskrit: ).

Some English-speaking Buddhists prefer the term "rebirth" or "re-becoming" (Sanskrit: punarbhava; Pali: punabbhava) to "reincarnation" as they take the latter to imply an entity (soul) that is reborn. Buddhism denies there is any such soul or self in a living being, but does assert that there is a cycle of transmigration consisting of rebirth and redeath as the fundamental nature of existence.

Historical context Before the time of the Buddha, many ideas on the nature of existence, birth and death were in vogue. The early layers of the Vedas do not mention the doctrine of Karma and rebirth but mention the belief in an afterlife. According to Sayers, these earliest layers of the Vedic literature show ancestor worship and rites such as sraddha (offering food to the ancestors). The later Vedic texts such as the Aranyakas and the Upanisads show a different soteriology based on reincarnation, they show little concern with ancestor rites, and they begin to philosophically interpret the earlier rituals. The idea of reincarnation and karma have roots in the Upanishads of the late Vedic period, predating the Buddha and the Mahavira. The Sramana schools affirmed the idea of soul, karma and cycle of rebirth. The competing Indian materialist schools denied the idea of soul, karma and rebirth, asserting instead that there is just one life, there is no rebirth, and death marks complete annihilation. From these diverse views, Buddha accepted the premises and concepts related to rebirth, but introduced innovations. According to various Buddhist scriptures, Buddha believed in other worlds,

Buddha also asserted that there is karma, which influences the future suffering through the cycle of rebirth, but added that there is a way to end the cycle of karmic rebirths through nirvana. The Buddha introduced the concept that there is no soul (self) tying the cycle of rebirths, in contrast to themes asserted by various Hindu and Jaina traditions, and this central concept in Buddhism is called anattā; Buddha also affirmed the idea that all compounded things are subject to dissolution at death or anicca.Arvind Sharma's review of Hajime Nakamura's A History of Early Vedanta Philosophy, Philosophy East and West, Vol. 37, No. 3 (Jul., 1987), page 330. The Buddha's detailed conception of the connections between action (karma), rebirth and causality is set out in the twelve links of dependent origination.

In Early Buddhism There are several references to rebirth in the Early Buddhist texts (henceforth EBTs). Some key suttas which discuss rebirth include Mahakammavibhanga Sutta (Majjhima Nikaya "MN" 136); Upali Sutta (MN 56); Kukkuravatika Sutta (MN 57); Moliyasivaka Sutta (Samyutta Nikaya "SN" 36.21); and Sankha Sutta (SN 42.8).

There are various terms which refer to the rebirth process, such as Āgati-gati, Punarbhava and others. The term Āgati literally means 'coming back, return', while Gati means 'going away' and Punarbhava means 're-becoming'. Numerous other terms for rebirths are found in the Buddhist scriptures, such as Punagamana, Punavasa, Punanivattati, Abhinibbatti, and words with roots of *jati and *rupa.

According to Damien Keown, the EBTs state that on the night of his awakening, the Buddha attained the ability to recall a vast number of past lives along with numerous details about them. These early scriptures also state that he could remember "as far as ninety one eons" (Majjhima Nikaya i.483). An interpretation of these memories is a link to deceased ancestors and their individual lives and memories, with later views interpreting these as personal memories of past lives.

Bhikkhu Sujato notes that there are three main principles of rebirth in early Buddhism:Sujato (2008). Rebirth and the In-between State in Early Buddhism.

Rebirth is regarded as an ongoing process to be escaped from in the search for liberation. Rebirth is determined by one's own mind, particularly one's ethical choices. The practice of Buddhism aims at ending rebirth.

According to Bhikkhu Anālayo, the Buddhist teaching of Dependent Origination is closely connected with the doctrine of rebirth. One of the 12 elements of Dependent Origination is "birth" (jati), which according to Anālayo refers to the rebirth of living beings. He cites SN 12.2 and its parallel in the Samyukta Āgama "SA" 298 as evidence. SN 12.2 defines "birth" in the context of Dependent Origination as "the birth of the various beings into the various orders of beings, their being born, descent into the womb, production, the manifestation of the aggregates, the obtaining of the sense bases."Saṁyutta Nikāya, Connected Discourses on Causation 12.2. Analysis of Dependent Origination , translated by Bhikkhu Bodhi, suttacentral.net.

The early Buddhist conception of rebirth is one in which consciousness is always dependent on other factors, mainly name and form (nama-rupa) which refers to the physical body and various cognitive elements (such as feeling, perception and volition). Because of this, consciousness (viññana) is seen as supported by the body and its cognitive apparatus and cannot exist without it (and vice versa). However, consciousness can jump from one body to another (this is compared to how a spark from a hot iron can travel through the air in AN 7.52). This process applies to the very moment of conception, which requires a consciousness to enter the womb. This is indicated by Dirgha Agama "DA" 13 and its parallels (DN 15, Madhyama Agama "MA" 97). DA 13 states: [The Buddha said]: Ananda, in dependence on consciousness there is name and form. What is the meaning of this? If consciousness did not enter the mother's womb, would there be name and form? [Ananda] replied: No.The same sutra states that if consciousness were to depart from the womb, the fetus could not continue to grow. Drawing on these sutras and others (such as SN 22.8 and SA 1265) Anālayo concludes that "consciousness appears to be what provides the transition from one body to another". He draws attention to the reciprocal conditioning between consciousness and name-and-form described in the Mahānidāna Sutta DN 15:21, which explicitly speaks of consciousness descending into the mother's womb, and when this has successfully happened, it then forms the condition for the continuity of name-and-form. This perspective ensures the type of continuity requires for karma and recollection of past lives without turning consciousness into an entity that exists on its own. At the same time, it also leaves room for discontinuity, after all the body (= form) does not continue and there must be some degree of discontinuity even for the mind, otherwise a small child would not have to learn various things all over again.

The EBTs also seem to indicate that there is an in-between state (antarābhava) between death and rebirth. According to Bhikkhu Sujato, the most explicit passage supporting this can be found in the Kutuhalasāla Sutta, which states that "when a being has laid down this body, but has not yet been reborn in another body, it is fuelled by craving."Sujato (2008), p. 6

Another term which is used to describe what gets reborn in the EBTs is gandhabba ("spirit"). According to the Assalayana Sutta (and its parallel at MA 151), for conception to be successful, a gandhabba must be present (as well as other physiological factors).

According to the EBTs, this rebirth consciousness is not a tabula rasa (blank slate), but contains certain underlying tendencies (anusaya) which in turn "form an object for the establishment of consciousness" (SA 359, SN 13.39). These subliminal inclinations are thus a condition for continued rebirth and also carry imprints from past lives.