Under Gods Command
Proverbs 10:18 He who conceals his hatred has lying lips, and whoever spreads slander is a fool.
By hating another person you may become a liar or a fool. If you try to conceal your hatred, you end up lying. If you slander the other person and are proven wrong, you are a fool. The only way out is to admit your hateful feelings to God. Ask him to change your heart, to help you love instead of hate.
Under Gods command 