SB 10.64.41
vipram krtagasam api
naiva druhyata mamakah
ghnantam bahu sapantam va
namas-kuruta nityasah
Translation:
My dear followers, never treat a learned brahmana harshly, even if he has sinned. Even if he attacks you physically or repeatedly curses you, always continue to offer him obeisances.
Purport:
Lord Krsna offers this instruction not only to His personal associates but to all those who claim to be followers of the Supreme Personality of Godhead.