Bhagavad Gita · 10.29

अनन्तश्चास्मि नागानां वरुणो यादसामहम्।पितॄणामर्यमा चास्मि यमः संयमतामहम्॥

anantaśh chāsmi nāgānāṁ varuṇo yādasām aham pitṝīṇām aryamā chāsmi yamaḥ saṁyamatām aham

Among the Nagas, I am Ananta (Shesha). Among aquatic beings, I am Varuna. Among the ancestors, I am Aryama. Among controllers and judges, I am Yama.

— Bhagavad Gita 10.29

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)