“Speak not evil one of another, brethren. He that speaketh evil of his brother, and judgeth his brother, speaketh evil of the law, and judgeth the law: but if thou judge the law, thou art not a doer of the law, but a judge.”
King James Version (KJV)
4:11 Speak not evil one of another - This is a grand hinderance of peace. O who is sufficiently aware of it! He that speaketh evil of another does in effect speak evil of the law, which so strongly prohibits it. Thou art not a doer of the law, but a judge - Of it; thou settest thyself above, and as it were condemnest, it.
Jas 4:11 Speak not evil one of another. The subject of the tongue is resumed. To speak evil is to make harsh, censorious judgments. Speaketh evil of the law, and judgeth the law. The "royal law" requires love of a brother, and when this law is thus violated by a harsh judgment the law itself is condemned. But when a man sets himself up as a judge of the law, he is no longer an humble and faithful doer of the law.