In Leviticus 19:17 (NASB)
‘You shall not hate your fellow countryman in your heart; you may certainly rebuke your neighbor, but you are not to incur sin because of him.
Then in Matthew 5:22 (NASB)
But I say to you that everyone who is angry with his brother shall be answerable to (the court; and whoever says to his brother, ‘You good-for-nothing,’ shall be answerable to the supreme court; and whoever says, ‘You fool,’ shall be guilty enough to go into the fiery hell.
Also, in Leviticus 19:18 (NASB)
You shall not take vengeance, nor hold any grudge against the sons of your people, but you shall love your neighbor as yourself; I am the Lord.
Then in Matthew 5:43-45 (NASB)
43 “You have heard that it was said, ‘You shall love your neighbor and hate your enemy.’ 44 But I say to you, love your enemies and pray for those who persecute you, 45 so that you may prove yourselves to be sons of your Father who is in heaven; for He causes His sun to rise on the evil and the good, and sends rain on the righteous and the unrighteous.