When the great sage Agastya, the son of Kumbha, was residing in the Malaya Hills and worshiping the Supreme Personality of Godhead, I approached him, and he explained to me this confidential history.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
इतिहासमिमं गुह्यं भगवान् कुम्भसम्भवः । कथयामास मलये आसीनो हरिमर्चयन्
itihāsamimaṃ guhyaṃ bhagavān kumbhasambhavaḥ | kathayāmāsa malaye āsīno harimarcayan
SB 6.3.35