Romans 12:14
Invoke blessings on your persecutors--blessings, not curses.
Matthew 5:22
But I say to you that every one who becomes angry with his brother shall be answerable to the magistrate; that whoever says to his brother 'Raca,' shall be answerable to the Sanhedrin; and that whoever says, 'You fool!' shall be liable to the Gehenna of Fire.
Matthew 5:43-44
"You have heard that it was said, 'Thou shalt love thy neighbour and hate thine enemy.'
Matthew 12:36
But I tell you that for every careless word that men shall speak they will be held accountable on the day of Judgement.
James 3:6
And the tongue is a fire. That world of iniquity, the tongue, is placed within us spotting and soiling our whole nature, and setting the whole round of our lives on fire, being itself set on fire by Gehenna.
James 3:9-10
With it we bless the Lord and Father, and with it we curse men, who are made in God's likeness.
1 Peter 2:22-23
He never sinned, and no deceitful language was ever heard from His mouth.
1 Peter 3:9
not requiting evil with evil nor abuse with abuse, but, on the contrary, giving a blessing in return, because a blessing is what you have been called by God to inherit.