Bhagavad Gita · 15.14

अहं वैश्वानरो भूत्वा प्राणिनां देहमाश्रितः।प्राणापानसमायुक्तः पचाम्यन्नं चतुर्विधम्॥

ahaṁ vaiśhvānaro bhūtvā prāṇināṁ deham āśhritaḥ prāṇāpāna-samāyuktaḥ pachāmy annaṁ chatur-vidham

Dwelling in the bodies of all living beings as the fire of digestion, I, united with the incoming and outgoing breath, digest the four kinds of food.

— Bhagavad Gita 15.14

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