Bhagavad Gita Chapter 10
Kṛṣṇa chooses the highest essential utility items
anantaścāsmi nāgānāṁ varuṇo yādasām aham pitṛṇāmaryamā cāsmi yamaḥ saṁyamatāmaham
Of the serpents, I am Ananta. Of the water deities, I am Varuṇa. Of the ancestors, I am Aryama and of the ones who ensure discipline, I am Yama