Shiva Purana
तन्नाभिकमले यो वै जातस्स च पितामहः ॥ तेनैव तपसा दृष्टस्स वै विष्णुरुदाहृतः ॥ ६॥
He who was born of his umbilical lotus was Pitāmaha. He who was seen by him through penance is said to be Viṣṇu.
english translation
tannAbhikamale yo vai jAtassa ca pitAmahaH ॥ tenaiva tapasA dRSTassa vai viSNurudAhRtaH ॥ 6॥
hk transliteration by Sanscript