Bhagavatapurana 10.64.41

10.64.41

vipraṃ kṛtāgasam api naiva druhyata māmakāḥ /
ghnantaṃ bahu śapantaṃ vā namas-kuruta nityaśaḥ //

41. & 42. "O my kinsmen, do no wrong at all even to the brahmin that does an offence, kill or reproach he may: always worship him; just as I every hour, with perfect control over My mind, bow to him, so do you. And whosoever may violate this, shall be the recipient of My punishment.