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.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
अग्निर्मुखं यस्य तु जातवेदा जातः क्रियाकाण्डनिमित्तजन्मा । अन्तःसमुद्रेऽनुपचन् स्वधातून् प्रसीदतां नः स महाविभूतिः
agnirmukhaṃ yasya tu jātavedā jātaḥ kriyākāṇḍanimittajanmā | antaḥsamudre'nupacan svadhātūn prasīdatāṃ naḥ sa mahāvibhūtiḥ
SB 8.5.35