Yogatattva Upanishad
The Yogatattva Upanishad (Sanskrit: योगतत्त्व उपनिषत्, IAST: Yogatattva Upaniṣhad), also called as Yogatattvopanishad (योगतत्त्वोपनिषत्), is an important Upanishad within Hinduism. A Sanskrit text, it is one of eleven Yoga Upanishads attached to the Atharvaveda, and one of twenty Yoga Upanishads in the four Vedas.