Establish. — Literally, let him stand erect.
For the righteous God trieth. — Better, thou trier of hearts and reins, thou just God. The Hebrew word translated try is used, like it, for testing metals (Psalms 12:6; Proverbs 17:3).
Related Commentaries of Psalms 7:9
Psalms 7:9
9 Oh let the wickedness of the wicked come to an end; but establish the just: for the righteous God trieth the hearts and reins.