Job 31:30
(yes, I have not allowed my mouth to sin by asking his life with a curse);
Romans 12:14
Bless those who persecute [you]; bless, and do not curse.
Exodus 23:4-5
"If you meet your enemy's ox or his donkey going astray, you shall surely bring it back to him again.
Ecclesiastes 5:2
Do not be rash with your mouth, and do not let your heart be hasty to utter anything before God; for God is in heaven, and you on earth. Therefore let your words be few.
Ecclesiastes 5:6
Do not allow your mouth to lead you into sin. Do not protest before the messenger that this was a mistake. Why should God be angry at your voice, and destroy the work of your hands?
Matthew 5:22
But I tell you, that everyone who is angry with his brother shall be in danger of the judgment; and whoever shall say to his brother, 'You good-for-nothing.' shall be in danger of the council; and whoever shall say, 'You fool.' shall be in danger of the fire of hell.
Matthew 5:43-44
"You have heard that it was said, 'You shall love your neighbor, and hate your enemy.'
Matthew 12:36
But I tell you that every idle word that men speak, they will give account of it 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 defiles the whole body, and sets on fire the course of nature, and is set on fire by hell.
James 3:9-10
With it we bless our Lord and Father, and with it we curse men, who are made in the image of God.
1 Peter 2:22-23
who did not sin, "neither was deceit found in his mouth."
1 Peter 3:9
not rendering evil for evil, or reviling for reviling; but instead blessing; because to this were you called, that you may inherit a blessing.