Bhagavad Gita - Chapter 8 - Verse 1-2
Arjuna inquired: O Purushottama (Supreme Person), what is Brahman? What is the self? What is karma? What is action? What is this material manifestation? Who are the demigods? Who is the object of sacrifice and how does He dwell within the body? O Madhusudana, how can You be known by those who are self-controlled at the time of death?