11 Do 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. 12 There is one Lawgiver, who is able to save and to destroy. Who are you to judge another? (James 4:11–12, NKJV).
God’s prophet gives us a plain warning not to speak evil of one another. “Speak evil” translates the Greek word katalaleo, “to be a traducer, i.e. to slander:–speak against (evil of)” (Strong’s Greek #2635). Words that belittle, defame, and libel other Christians (or anyone, for that matter) are sins against brethren, against God, and His law. James does not negate the accurate, appropriate judging of sin. For example, the apostle Paul said we judge unrepentant Christians (“those who are inside”) by applying corrective discipline and putting away the evil person from ourselves (1 Cor. 5:12-13). James is condemning unrighteous judgments that are void of divine truth. He addresses and exposes the sinful “wars and fights” that arise among Christians in this context (James 4:1). Divisive, factious words and actions are worldly and prideful (James 4:1-6). We “become judges with evil thoughts” when we quickly think the worst, grumble and complain against one another, and show partiality in our treatment of one another (James 2:4, 12-13; 5:9). We become the law or standard by which we judge others. James cautions us to remember God is the Lawgiver to whom we are all answerable. He saves and destroys; therefore, we give place to His judgments. Let us not become judges of one another to our destruction.