Chapter 4 · Knowledge and Renunciation of Action · Krishna said
Bhagavad Gita 4.25 — Kinds of yajna
दैवमेवापरे यज्ञं योगिनः पर्युपासते। ब्रह्माग्नावपरे यज्ञं यज्ञेनैवोपजुह्वति ॥
daivamevāpare yajñaṃ yoginaḥ paryupāsate | brahmāgnāvapare yajñaṃ yajñenaivopajuhvati ||
Meaning
Some yogis perform yajna as worship of the gods, while others offer the self itself as yajna into the fire of Brahman.