JMNT(i)
11 Brothers (= believers in God’s household) do not be continuously (or: stop constantly) speaking down (or: gossiping or babbling; wearing someone down by talking; talking a person down) against one another. The one habitually speaking down against a brother (= a fellow believer, or, a fellow Israelite; or: = a member of God’s household), and continuously judging (separating and making decisions about) his brother, is continuously speaking down against law, and thus keeps on judging (making separations and then decisions about) law. Now if you continue judging law, you are not being a performer (a doer) of law, but rather, a judge (one who makes separations and decisions).
12 There is one Lawgiver and Separator (Decider; Evaluator; Judge): the One being continuously able and powerful to deliver (rescue; heal; save; restore to wholeness), as well as to cause loss (or: bring a condition of utter ruin; or: cause [something or someone] to be lost; or: destroy). So you, who are you, the one continuously judging the one near you (repeatedly separating the neighbor; or: presently making decisions about [your] associate)?