The Law Code of Parāśara 12.8

Parāśarasmṛti 12.8

godvayaṃ dakṣiṇāṃ dadyāc chuddhiṃ svāyaṃbhuvo 'bravīt /
mucyate tena pāpena brāhmaṇatvaṃ ca gacchati //