Srimad Bhagavatam Canto 10, Chapter 14, Text 14

SB 10.14.14

narayanas tvam na hi sarva-dehinam
atmasy adhisakhila-loka-saksi
narayano ’ngam nara-bhu-jalayanat
tac capi satyam na tavaiva maya
Are You not the original Narayana, O supreme controller, since You are the Soul of every embodied being and the eternal witness of all created realms? Indeed, Lord Narayana is Your expansion, and He is called Narayana because He is the generating source of the primeval water of the universe. He is real, not a product of Your illusory Maya.
In the Caitanya-caritamrta, Adi-lila, Chapter Two, text 30, Srila Prabhupada comments on this verse as follows: “This statement which is from Srimad-Bhagavatam (10.14.14) was spoken by Lord Brahma in his prayers to Lord Krsna after the Lord had defeated him by displaying His mystic powers. Brahma had tried to test Lord Krsna to see if He was really the Supreme Personality of Godhead playing as a cowherd boy. Brahma stole all the other boys and their calves from the pasturing grounds, but when he returned to the pastures he saw that all the boys and calves were still there, for Lord Krsna had created them all again. When Brahma saw this mystic power of Lord Krsna’s, he admitted defeat and offered prayers to the Lord, addressing Him as the proprietor and seer of everything in the creation and as the Supersoul who is within each and every living entity and is dear to all. That Lord Krsna is Narayana, the father of Brahma, because Lord Krsna’s plenary expansion Garbhodakasayi Visnu, after placing Himself on the Garbha Ocean, created Brahma from His own body. Maha-Visnu in the Causal Ocean and Ksirodakasayi Visnu, the Supersoul in everyone’s heart, are also transcendental expansions of the Supreme Truth.”
In his commentary on this verse, Srila Sanatana Gosvami has elaborately explained the expansion of the Visnu, or Narayana, incarnations from the original form of Godhead, Lord Sri Krsna. The essence is that although Lord Brahma was born from Lord Narayana, Brahma now understands that Narayana is Himself a mere expansion of the original Personality of Godhead, Lord Sri Krsna.
Srimad Bhagavatam Canto 10, Chapter 14, Text 13
Srimad Bhagavatam Canto 10, Chapter 14, Text 15