CC Ādi 2.34

kṛṣṇa kahena — brahmā, tomāra pitā nārāyaṇa
āmi gopa, tumi kaiche āmāra nandana
Word for word: 
kṛṣṇa — Lord Kṛṣṇa; kahena — says; brahmā — O Lord Brahmā; tomāra — your; pitā — father; nārāyaṇa — Lord Nārāyaṇa; āmi — I (am); gopa — cowherd boy; tumi — you; kaiche — how; āmāra — My; nandana — son.
Translation: 
Śrī Kṛṣṇa said, “O Brahmā, your father is Nārāyaṇa. I am but a cowherd boy. How can you be My son?”