Romans 12:14
Bless them that persecute you; bless, and scold not.
Matthew 5:22
but I say unto you that every one being angry with his brother, shall be in danger of the judgment; and whosoever may say to his brother, Thou scoundrel, shall be in danger of the council; and whosoever may say, Thou fool, shall be liable unto a hell of fire.
Matthew 5:43-44
You have heard that it was said, Thou shalt love thy neighbor and hate thine enemy.
Matthew 12:36
And I say unto you, that every idle word whatsoever men shall speak, they shall give an account concerning the same in the day of judgment.
James 3:6
The tongue, a fire, the world of iniquity: the tongue sits down in the midst of our members, and corrupting the whole body, and setting on fire the course of nature; and it is set on fire from hell.
James 3:9-10
With it we bless the Lord, even the Father; and with it we scold the people, who have been made after the image of God:
1 Peter 2:22-23
who did no sin, neither was guile found in his mouth,
1 Peter 3:9
not giving evil for evil, or railing for railing: but on the contrary blessing; because unto this you have been called, that you may inherit the blessing.