James says not to speak evil against one another (James 4:11). He adds that there is one Lawgiver and Judge, emphasizing that judgment belongs to God (James 4:12).
In James 4:11–12, James commands the community to stop speaking against one another. He says that when someone slanders and “judges” a fellow member, they are not only targeting that person but are also taking a stance over “the law” itself, as if they can evaluate it. This unit sits inside James’s wider push for community life marked by humility, peace, and restrained speech. Just before it, James critiques conflicts driven by desires and pride and calls readers to submit to God, resist the devil, and humble themselves (4:1–10).
James addresses community speech: “speaking against” a fellow believer is treated as closely tied to “judging” them (explicit). He then adds a second link: the one who judges a brother also “speaks against the law” and “judges the law” (explicit).
A careful answer keeps the immediate passage, the book's argument, and the whole-Bible storyline together, so the question is answered in context instead of as a detached idea.
Start with James 4:11, then read the surrounding section so the answer stays connected to the passage's flow.
11Don`t speak against one another, brothers. He who speaks against a brother and judges his brother, speaks against the law and judges the law. But if you judge the law, you are not a doer of the law, but a judge.