अधियज्ञः कथं कोऽत्र देहेऽस्मिन्मधुसूदन। प्रयाणकाले च कथं ज्ञेयोऽसि नियतात्मभिः ॥

adhiyajñaḥ kathaṁ ko ’tra dehe ’smin madhusūdana prayāṇa-kāle cha kathaṁ jñeyo ’si niyatātmabhiḥ

What is the knowledge of Sacrifice in this body, and how, O, Madhusûdana? And how, at the time of forthgoing art Thou known by the Self -controlled?

In plain words: Arjuna, calling Krishna Madhusudana (slayer of the demon Madhu), asks what sacrifice inside the body means, and how self-controlled people know Krishna at the moment of death.