Job 31:30
for I have never even suffered my mouth to sin by wishing a curse upon his soul;
Romans 12:14
Bless those who persecute you: bless, and do not curse.
Exodus 23:4-5
If thou should encounter thine enemy's ox or his ass astray, thou shalt surely bring it back to him again.
Ecclesiastes 5:2
Do not be rash with thy mouth and do not let thy heart be hasty to utter any thing 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 it was ignorance. Why should thou cause God to be angry because of thy voice and destroy the work of thine hands?
Matthew 5:22
but I say unto you, That whosoever is angry with his brother out of control shall be in danger of the judgment, and whosoever shall insult his brother shall be in danger of the council, but whosoever shall say, Thou art impious, shall be in danger of hell.
Matthew 5:43-44
Ye have heard that it was said, Thou shalt love thy neighbour, and hate thine enemy.
Matthew 12:36
But 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, a world of iniquity: so is the tongue among our members, that it defiles the whole body and sets on fire the course of our nature; and it is set on fire of hell.
James 3:9-10
With it we bless God, even the Father; and with it we curse men, who are made in 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 rendering evil for evil or curse for curse, but to the contrary, blessing, knowing that ye are called, that ye should possess a blessing by inheritance.