1 John 4:20-21
Whoever claims to love God yet hates a brother or sister is a liar. For whoever does not love their brother and sister, whom they have seen, cannot love God, whom they have not seen. And he has given us this command: Anyone who loves God must also love their brother and sister.
1 John 2:9 -11
He that saith he is in the light, and hateth his brother, is in darkness even until now. He that loveth his brother abideth in the light, and there is none occasion of stumbling in him. But he that hateth his brother is in darkness, and walketh in darkness, and knoweth not whither he goeth, because that darkness hath blinded his eyes.
Anyone who hates another brother or sister is really a murderer at heart. And you know that murderers don't have eternal life within them.
But whoever has this world's goods, and sees his brother in need, and shuts up his heart from him, how does the love of the Lord abide in him?
So when you are offering your gift at the alter, if you remember that your brother or sister has something against you, leave your gift there before the alter and go; first be reconciled to your brother or sister, and then come and offer your gift.
James 4:11Romans 12:10Do not speak evil of one another, brethren. He who speaks evil of a brother and judges his brother, speaks evil of the law and judges the law. But if you judge the law, you are not a doer of the law but a judge. There is one Lawgiver, who is able to save and to destroy. Who are you to judge another?
Be kindly affectioned one to another with brotherly love; in honour preferring one another; Not slothful in business; fervent in spirit; serving the Lord;