1 Corinthians 6:8

Your brethren. Their wrong was not confined to their dealings with unbelievers; they behaved deceitfully and unjustly with one another in the church. Fraud and injustice are always wrong, no matter who commits these sins, but they appear particularly detestable when practiced among brethren in the church. The offense in such a case seems exaggerated, because it reveals an absence of love and respect for those who should be regarded with particular affection and esteem. A church member has lost his love for God and his brethren when he descends to acts of injustice and unkindness to his fellow believers in the church.