CC Adi 5.107
- hena nārāyaṇa,—yāṅra aṁśera aṁśa
- sei prabhu nityānanda—sarva-avataṁsa
hena—such; nārāyaṇa—Lord Nārāyaṇa; yāṅra—of whom; aṁśera—of the plenary part; aṁśa—a part; sei—that; prabhu—the Lord; nityānanda—Nityānanda; sarva-avataṁsa—the source of all incarnations.
That Lord Nārāyaṇa is a part of a plenary part of Lord Nityānanda Balarāma, who is the source of all incarnations.