All of us. No Christian is completely without sin! This included James himself. See what John says in 1 John 1:8-10. But it is more serious when a teacher makes a mistake. In what he says. James is thinking of the ranting and raving which certain Jews did in arguing matters of religion, as well as teaching false things. Compare Matthew 5:22 and note. We can also apply this to everyday life, since the tongue demonstrates the inner man.

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Old Testament