Mandalabrahmana Upanishad

It is attached to the Shukla Yajurveda and is classified as one of the 20 Yoga Upanishads. Mandala means sphere, and the text is known as Mandala-brahmana Upanishad because the Purusha in the sphere of the Sun (Narayana) gave this knowledge to Yagnavalakya. The text describes Yoga as a means to self-knowledge, the highest wisdom. Its text is structured as a teaching from Narayana,(Purusha in Sun, Vishnu), to sage Yajnavalkya. The text is notable for teaching eight step Yoga but with somewhat different conceptual framework than most other texts. The teachings of the text combine different types of Yoga with non dual Vedanta philosophy.