Holy Upanishads are a sacred text of Hinduism.
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The Upanishads are part of the Hindu Shruti scriptures which primarily discuss meditation and philosophy and are seen as religious instructions by most schools of Hinduism.

They also contain transcripts of various spiritual debates or discussions, and of the 123 books considered to be part of the Upanishads, 12 are accepted by all Hindus as primary.

The term Upanishad derives from the Sanskrit words upa (near), ni (down) and s(h)ad (to sit) i.e., sitting down near; implying the act of listening to a spiritual teacher. The Upanishads are commentaries on the Vedas, their putative end and essence, and thus known as Vedanta ("End of the Veda").

Intro taken from en.wikipedia.org/wiki/Upanishads