Matthew 5:9, 22

“How joyful you are when you make peace! For then you will be recognized as a true child of God.

But I’m telling you, if you hold anger in your heart toward a fellow believer, you are subject to judgment. And whoever demeans and insults a fellow believer is answerable to the congregation. And whoever calls down curses upon a fellow believer is in danger of being sent to a fiery hell.