SB 10.43.23

etau bhagavataḥ sākṣād
 dharer nārāyaṇasya hi
avatīrṇāv ihāṁśena
 vasudevasya veśmani
Word for word: 
etau — these two; bhagavataḥ — of the Supreme Lord; sākṣāt — directly; hareḥ — of Lord Hari; nārāyaṇasya — Nārāyaṇa; hi — certainly; avatīrṇau — have descended; iha — to this world; aṁśena — as expansions; vasudevasya — of Vasudeva; veśmani — in the home.
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.