Romans 12:14
bless and curse not.
Matthew 5:22
But I say unto you, That whosoever is angry with his brother, shall be liable to the judgment; and whosoever shall say to his brother, Raca, shall be liable to the council; but whosoever shall say, Thou fool, shall be liable to hell-fire.
Matthew 5:43-44
Ye have heard, that it hath been said, Thou shalt love thy neighbour, and hate thine enemy.
Matthew 12:36
But I say to you, That every idle word which men shall speak, they shall give account thereof in the day of judgment.
James 3:6
And the tongue is a fire, a world of iniquity: it is the tongue among the members which defileth the whole body and setteth on fire the course of nature, and is set on fire of hell.
James 3:9-10
Therewith bless we God the Father, and therewith curse we man, 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 rendering evil for evil, or railing for railing, but contrariwise blessing; knowing that ye are called to this, to inherit a blessing.