Anyone who hates a brother or sister is in the darkness and walks around in the darkness. They do not know where they are going, because the darkness has blinded them. (I John 2:10)
The Bible tells us that hatred of our brothers and sisters will lead us into darkness, that means it will lead us away both from good morality and good doctrine. The difficulty is that as human beings, hate comes naturally to us. We must ask God to give us a spirit of love towards each other instead.