Job 31:30
also 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 ass 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 say a word before God. For God is in Heaven, and you are on earth; therefore let your words be few.
Ecclesiastes 5:6
Do not allow your mouth to cause your flesh to sin; do not say before the angel that it was an error. Why should God be angry at your voice and destroy the work of your hands?
Matthew 5:22
But I say to you that whoever is angry with his brother without a cause shall be liable to the judgment. And whoever shall say to his brother, Raca, shall be liable to the sanhedrin; but whoever shall say, Fool! shall be liable to be thrown into 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 say to you that every idle word, whatever men may speak, they shall give account of it in the day of judgment.
James 3:6
And the tongue is a fire, a world of iniquity. So the tongue is set among our members, spotting all the body and inflaming the course of nature, and being inflamed by hell.
James 3:9-10
By this we bless God, even the Father. And by this we curse men, who have come into being according to the image of God.
1 Peter 2:22-23
He who did no sin, nor was guile found in His mouth,
1 Peter 3:9
Never give back evil for evil, or reviling for reviling, but on the contrary, giving blessing, knowing that you are called to this so that you might inherit blessing.