Verse
अहं वैश्वानरो भूत्वा प्राणिनां देहमाश्रितः ।प्राणापानसमायुक्तः पचाम्यन्नं चतुर्विधम् ॥
I, having become the flame of life, sustain the physical body of living creatures, and united with Prana and Apana, digest the four kinds of food.
Gītā 15·14