अधिभूतं क्षरो भावः पुरुषश्चाधिदैवतम् ।अधियज्ञोऽहमेवात्र देहे देहभृतां वर ॥
adhibhūtaṃ kṣaro bhāvaḥ puruṣaścādhidaivatam |adhiyajño'hamevātra dehe dehabhṛtāṃ vara ||
The adhibhuta is the perishable nature of things, and the purusha is the adhidaivata. And here in this body, O best of embodied beings, I myself am the adhiyajna.
Explanation
Krishna is still answering Arjuna's questions from the start of the chapter, defining terms like adhibhuta (the realm of beings and matter), adhidaivata (the governing divine principle) and adhiyajna (the one presiding over sacrifice). Here he says the perishable nature of things (kṣara) is adhibhuta, the cosmic person (puruṣa) is adhidaivata, and he himself, present in the body, is adhiyajna. Commentators differ on whether the puruṣa is Hiraṇyagarbha, the sun's presiding being, or the Supreme itself, and on how Krishna's presence 'in the body' is understood.