Job 31:30
(yea, I have not allowed my mouth to sin by asking his life with a curse);
Romans 12:14
Bless those who persecute you. Bless ye and do not curse.
Exodus 23:4-5
If thou meet thine enemy's ox or his donkey going astray, thou shall 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
Do not allow thy mouth to cause thy flesh to sin, nor say thou before the [heavenly] agent, that is was an error. Why should God be angry at thy voice, and destroy the work of thy hands?
Matthew 5:22
But I say to you, that every man who is angry at his brother without cause will be liable to the judgment, and whoever speaks an insult to his brother will be liable to the council, and whoever says, Foolish man, will be liable to
Matthew 5:43-44
Ye have heard that it was said, Thou shall love thy neighbor, and hate thine enemy.
Matthew 12:36
But I say to you, that every idle word, whatever men may speak, they will render account about it in the day of judgment.
James 3:6
And the tongue is a fire, the world of unrighteousness. Thus, the tongue is made to lead among our body-parts, defiling the whole body, and setting the cycle of nature on fire, and being set on fire by hell.
James 3:9-10
By it we bless the God and Father, and by it we curse men, who were made according to a likeness of God.
1 Peter 2:22-23
Who did no sin, nor was deceit found in his mouth.
1 Peter 3:9
not rendering evil for evil, or reviling for reviling, but instead giving praise, knowing that ye were called for this, so that ye might inherit a blessing.