Matsyapurana 61.17

61.17

yadā ca mānuṣatve 'pi tvayāgastyena śoṣitaḥ
bhaviṣyatyudadhirvahne tadā devatvamāpsyasi //

and Śâstra; therefore You, O fire, will now be born by assuming one body along with Maruta, among the mortals, in the form of a sage. In that form of the sage Agastya, you will dry up the ocean, after which you will again come back to your Divine form.”—14-17.