Job 31:30
(Yea, I have not suffered by mouth to sin By asking his life with a curse);
Romans 12:14
Bless them that persecute you; bless, and curse not.
Exodus 23:4-5
If thou meet thine enemy's ox or his ass going astray, thou shalt surely bring it back to him again.
Ecclesiastes 5:2
Be not rash with thy mouth, and let not thy heart be hasty to utter anything before God; for God is in heaven, and thou upon earth: therefore let thy words be few.
Ecclesiastes 5:6
Suffer not thy mouth to cause thy flesh to sin; neither say thou before the angel, that is was an error: wherefore should God be angry at thy voice, and destroy the work of thy hands?
Matthew 5:22
but I say unto you, that every one who is angry with his brother shall be in danger of the judgment; and whosoever shall say to his brother, Raca, shall be in danger of the council; and whosoever shall say, Thou fool, shall be in danger of the hell of fire.
Matthew 5:43-44
Ye 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 that men shall speak, they shall give account thereof in the day of judgment.
James 3:6
And the tongue is a fire: the world of iniquity among our members is the tongue, which defileth the whole body, and setteth on fire the wheel of nature, and is set on fire by hell.
James 3:9-10
Therewith bless we the Lord and Father; and therewith curse we men, who are 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 reviling for reviling; but contrariwise blessing; for hereunto were ye called, that ye should inherit a blessing.