Charles Ellicott Commentary Psalms 94:15

"For judgment shall return unto righteousness; And all the upright in heart shall follow it." — Psalms 94:15 (ASV)

But. —Better, For; literally, for to righteousness judgment shall turn, and after it all upright in heart—that is, there shall no longer be the apparent contradiction in things. God’s righteousness will triumph over the injustice under which Israel groans; His ways will be vindicated, so that all the upright in heart will acknowledge that there is a reward for the righteous, a God who judges in the earth (Psalms 58:11).

Luther’s fine paraphrase, “For Right must, whatever happens, remain Right,” expresses the feeling; but, better still, the question, Shall not the Lord of all the earth do right? The phrase “shall after it” is a common one for expressing attachment and adherence to a party or cause (Exodus 23:2; 2 Samuel 2:10; Psalms 49:13), and especially of adherence to Jehovah (1 Samuel 12:14; 1 Kings 14:8).