Romans 12:14
Bless those who persecute you; bless, and curse not.
Matthew 5:22
But I say to you that every one who is angry with his brother shall be in danger of the judgment; and whosoever says to his brother Raca shall be in danger of the high-council; and whosoever shall say, O foolish one! shall be in danger of the Hell of fire.
Matthew 5:43-44
"Ye heard that it was said, 'You shall love your neighbor, and hate your enemy;'
Matthew 12:36
And I say to you, that every idle word that men shall speak, they shall give account concerning it in the day of judgment;
James 3:6
And the tongue is a fire, the world of iniquity! the tongue is placed among our members, as that which defiles the whole body, and sets on fire the course of life, and is set on fire by Hell.
James 3:9-10
Therewith we bless the Lord and Father; and therewith we curse men, who have been made after the likeness of God.
1 Peter 2:22-23
Who did no sin, neither was guile found in his mouth;
1 Peter 3:9
not returning evil for evil, or reviling for reviling; but, on the contrary, blessing; because to this end ye were called, that ye might inherit a blessing.