Garudapurana 2.3.59

2.3.59

mahājvālī duhitaraṃ snuṣāṃ gacchati yastu vai /
vedo vikrīyate yaiśca vedaṃ dūṣayate tu yaḥ //

[into] Mahājvāla [goes] he who consorts with his daughter or daughter-in-law, / those by whom the Veda is sold, and he who defiles the Veda;