Srimad-Bhagavatam: Canto 8 - Chapter 1 - Verse 35
Sanskrit:
अग्निर्मुखं यस्य तु जातवेदाजात: क्रियाकाण्डनिमित्तजन्मा ।अन्त:समुद्रेऽनुपचन्स्वधातून्प्रसीदतां न: स महाविभूति: ॥ ३५ ॥
ITRANS:
agnir mukhaṁ yasya tu jāta-vedājātaḥ kriyā-kāṇḍa-nimitta-janmāantaḥ-samudre ’nupacan sva-dhātūnprasīdatāṁ naḥ sa mahā-vibhūtiḥ
Translation:
Fire, which is born for the sake of accepting oblations in ritualistic ceremonies, is the mouth of the Supreme Personality of Godhead. Fire exists within the depths of the ocean to produce wealth, and fire is also present in the abdomen to digest food and produce various secretions for the maintenance of the body. May that supremely powerful Personality of Godhead be pleased with us.