What new text from c.900 - 600 B.C.E.introduced the idea of transmigration of the soul?

Name: What new text from c.900 - 600 B.C.E.introduced the idea of transmigration of the soul?
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The Upanishads, a collection of Hindu texts from c.900-600 B.C.E., introduced the idea of transmigration of the soul, also known as reincarnation or samsara. This concept became a cornerstone of Hindu philosophy, and is still widely believed and practiced today.

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