Srimad-Bhagavatam: Canto 4 - Chapter 1 - Verse 36
Sanskrit:
पुलस्त्योऽजनयत्पत्न्यामगस्त्यं च हविर्भुवि ।सोऽन्यजन्मनि दह्राग्निर्विश्रवाश्च महातपा: ॥ ३६ ॥
ITRANS:
pulastyo ’janayat patnyāmagastyaṁ ca havirbhuviso ’nya-janmani dahrāgnirviśravāś ca mahā-tapāḥ
Translation:
Pulastya begot in his wife, Havirbhū, one son of the name Agastya, who in his next birth became Dahrāgni. Besides him, Pulastya begot another very great and saintly son, whose name was Viśravā.