1 John 3:15
Anyone who hates his brother is a murderer, and you know that no murderer has eternal life remaining within him.
Matthew 18:15
If your brother sins [against you], go and reprove him, as between you and him alone. If he listens to you, then you have won your brother over;
Ephesians 4:26
Be angry but do not sin; never let the sun set upon your exasperation,
Ephesians 4:31
Drop all bitter feeling and passion and anger and clamouring and insults, together with all malice;
1 John 2:9
He who says he is 'in the light' and hates his brother, is in darkness still.
1 John 2:11
but he who hates his brother is in darkness, he walks in darkness and does not know where he is going, for the darkness has blinded his eyes.