Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 47
Sanskrit:
श्रीभगवानुवाचआसन्मरीचे: षट् पुत्रा ऊर्णायां प्रथमेऽन्तरे ।देवा: कं जहसुर्वीक्ष्य सुतं यभितुमुद्यतम् ॥ ४७ ॥
ITRANS:
śrī-bhagavān uvācaāsan marīceḥ ṣaṭ putrāūrṇāyāṁ prathame ’ntaredevāḥ kaṁ jahasur vīkṣyasutaṁ yabhitum udyatam
Translation:
The Supreme Lord said: During the age of the first Manu, the sage Marīci had six sons by his wife Ūrnā. They were all exalted demigods, but once they laughed at Lord Brahmā when they saw him preparing to have sex with his own daughter.