Sikhism no relation Hinduism
Reincarnation, also known as rebirth, transmigration, or metempsychosis (Greek) is the philosophical or religious concept that the non-physical essence of a living being begins a new life in a different physical form or body after biological death. In most beliefs involving reincarnation, the soul of a human being is immortal and does not disperse after the physical body has perished. Upon death, the soul merely becomes transmigrated into a newborn baby or an animal to continue its immortality. The term transmigration means the passing of a soul from one body to another after death.
Reincarnation (punarjanma) is a central tenet of the Indian religions such as Hinduism, Buddhism, Jainism, and Sikhism; although there are Hindu and Pagan groups who do not believe in reincarnation, instead believing in an afterlife. In various forms, it occurs as an esoteric belief in many streams of Judaism, certain pagan religions including Wicca, and some beliefs of the Indigenous peoples of the Americas and Indigenous Australians (though most believe in an afterlife or spirit world). A belief in rebirth/metempsychosis was held by Greek historical figures, such as Pythagoras, Socrates, and Plato.Although the majority of denominations within Christianity and Islam do not believe that individuals reincarnate, particular groups within these religions do refer to reincarnation; these groups include the mainstream historical and contemporary followers of Cathars, Alawites, the Druze, and the Rosicrucians. The historical relations between these sects and the beliefs about reincarnation that were characteristic of Neoplatonism, Orphism, Hermeticism, Manichaenism, and Gnosticism of the Roman era as well as the Indian religions have been the subject of recent scholarly research. In recent decades, many Europeans and North Americans have developed an interest in reincarnation, and many contemporary works mention it.History
Origins
The origins of the notion of reincarnation are obscure. Discussion of the subject appears in the philosophical traditions of India. The Greek Pre-Socratics discussed reincarnation, and the Celtic druids are also reported to have taught a doctrine of reincarnation.Early Jainism, Buddhism, and Hinduism
The concepts of the cycle of birth and death, Saṁsāra, and liberation partly derive from ascetic traditions that arose in India around the middle of the first millennium BCE. The first textual references to the idea of reincarnation appear in the Upanishads of the late Vedic period (c. 1100 – c. 500 BCE), predating the Buddha and the Mahavira. Though no direct evidence of this has been found, the tribes of the Ganges valley or the Dravidian traditions of South India have been proposed as another early source of reincarnation beliefs.The idea of reincarnation, Saṁsāra, did not exist in the early Vedic religions. The early Vedas do not mention the doctrine of Karma and rebirth but mention the belief in an afterlife. It is in the early Upanishads, which are pre-Buddha and pre-Mahavira, where these ideas are developed and described in a general way. Detailed descriptions first appear around the mid-1st millennium BCE in diverse traditions, including Buddhism, Jainism and various schools of Hindu philosophy, each of which gave unique expression to the general principle.The texts of ancient Jainism that have survived into the modern era are post-Mahavira, likely from the last centuries of the first millennium BCE, and extensively mention rebirth and karma doctrines. The Jaina philosophy assumes that the soul (jiva in Jainism; atman in Hinduism) exists and is eternal, passing through cycles of transmigration and rebirth. After death, reincarnation into a new body is asserted to be instantaneous in early Jaina texts. Depending upon the accumulated karma, rebirth occurs into a higher or lower bodily form, either in heaven or hell or earthly realm. No bodily form is permanent: everyone dies and reincarnates further. Liberation (kevalya) from reincarnation is possible, however, through removing and ending karmic accumulations to one's soul. From the early stages of Jainism on, a human being was considered the highest mortal being, with the potential to achieve liberation, particularly through asceticism.The early Buddhist texts discuss rebirth as part of the doctrine of Saṃsāra. This asserts that the nature of existence is a "suffering-laden cycle of life, death, and rebirth, without beginning or end."  Also referred to as the wheel of existence (Bhavacakra), it is often mentioned in Buddhist texts with the term punarbhava (rebirth, re-becoming). Liberation from this cycle of existence, Nirvana, is the foundation and the most important purpose of Buddhism. Buddhist texts also assert that an enlightened person knows his previous births, a knowledge achieved through high levels of meditative concentration. Tibetan Buddhism discusses death, bardo (an intermediate state), and rebirth in texts such as the Tibetan Book of the Dead. While Nirvana is taught as the ultimate goal in the Theravadin Buddhism, and is essential to Mahayana Buddhism, the vast majority of contemporary lay Buddhists focus on accumulating good karma and acquiring merit to achieve a better reincarnation in the next life.In early Buddhist traditions, Saṃsāra cosmology consisted of five realms through which the wheel of existence cycled. This included hells (niraya), hungry ghosts (pretas), animals (tiryak), humans (manushya), and gods (devas, heavenly). In latter Buddhist traditions, this list grew to a list of six realms of rebirth, adding demigods (asuras).Comparison
Early texts of Hinduism, Buddhism and Jainism share the concepts and terminology related to reincarnation. They also emphasize similar virtuous practices and karma as necessary for liberation and what influences future rebirths. For example, all three discuss various virtues—sometimes grouped as Yamas and Niyamas—such as non-violence, truthfulness, non-stealing, non-possessiveness, compassion for all living beings, charity and many others.Hinduism, Buddhism and Jainism disagree in their assumptions and theories about rebirth. Hinduism relies on its foundational assumption that 'soul, Self exists' (atman or attā), in contrast to Buddhist assumption that there is 'no soul, no Self' (anatta or anatman). Hindu traditions consider soul to be the unchanging eternal essence of a living being, and what journeys across reincarnations until it attains self-knowledge. Buddhism, in contrast, asserts a rebirth theory without a Self, and considers realization of non-Self or Emptiness as Nirvana (nibbana). Thus Buddhism and Hinduism have a very different view on whether a self or soul exists, which impacts the details of their respective rebirth theories.The reincarnation doctrine in Jainism differs from those in Buddhism, even though both are non-theistic Sramana traditions. Jainism, in contrast to Buddhism, accepts the foundational assumption that soul exists (Jiva) and asserts this soul is involved in the rebirth mechanism. Further, Jainism considers asceticism as an important means to spiritual liberation that ends all reincarnation, while Buddhism does not.
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