Leviticus 19:17-18
Do not hate a fellow Israelite in your heart. Rebuke your neighbor frankly so you will not share in their guilt. Do not seek revenge or bear a grudge against anyone among your people, but love your neighbor as yourself. I am the Lord.
(Romans 12:19-20 NIV) Do not take revenge, my friends, but leave room for God's wrath, for it is written: "It is mine to avenge; I will repay," says the Lord. {20} On the contrary: "If your enemy is hungry, feed him; if he is thirsty, give him something to drink. In doing this, you will heap burning coals on his head."