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In page Human sacrifice:

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Human and animal sacrifice became less common during the post-Vedic period, as ahimsa (non-violence) became part of mainstream religious thought. The Chandogya Upanishad (3.17.4) includes ahimsa in its list of virtues.[5] The impact of Sramanic religions such as Buddhism and Jainism also became known in the Indian subcontinent.[citation needed]