Humans are neither the lawgiver nor the judge
James gives another proverb-like command when he talks about speaking and judging negatively about our fellow Christians. He says Christians are not to “speak against one another” nor are they to “judge [their] brother” (James 4:11, 12).
Addressing them as “brethren,” James says when a person slanders another Christian then they are “speaking against the law.” Their motivation is to expose someone so as to bring shame upon them by giving false information or misrepresenting tr