Curse not the king, no not in thy thought; and curse not the rich in thy bedchamber: for a bird of the air shall carry the voice, and that which hath wings shall tell the matter. Ecclesiastes 10:20.

Bless them that curse you, and pray for them which despitefully use you. Luke 6:28.

Bless them which persecute you: bless, and curse not. Romans 12:14.

Out of the same mouth proceedeth blessing and cursing. My brethren, these things ought not so to be. James 3:10.