Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 23
Sanskrit:
एतौ भगवत: साक्षाद्धरेर्नारायणस्य हि । अवतीर्णाविहांशेन वसुदेवस्य वेश्मनि ॥ २३ ॥
ITRANS:
etau bhagavataḥ sākṣāddharer nārāyaṇasya hiavatīrṇāv ihāṁśenavasudevasya veśmani
Translation:
[The people said:] These two boys are certainly expansions of the Supreme Lord Nārāyaṇa who have descended to this world in the home of Vasudeva.