Psalms 99:4

4. The king’s strength also loveth judgment “The meaning seems to be, that God’s power is controlled in its exercise by his love of justice.” Alexander. But who is the “king?” The most natural construction would refer it to David, (or Solomon,) whose administration is regarded as the type and expression of the true theocracy. The language conforms to the description given of David’s reign, (2 Samuel 8:15,) “And David reigned over all Israel; and David executed judgment and justice unto all his people.” Also David’s charge to Solomon, (2 Samuel 23:3,) “He that ruleth over men must be just, ruling in the fear of God.” The next sentence is an address to Jehovah:

Thou dost establish equity That is, a government thus conformed to thine, and of thine appointment, thou wilt render firm and effective against all hostility.

In Jacob An enlargement of “in Zion,” (Psalms 99:2,) but prophetically the true Church. And so, from the ground idea found in the history of David’s throne, above given, we must advance to the conception of Messiah’s kingdom. The verbs in the last clause are in the preterit, but equally apply to the future kingdom of Messiah, because they affirm what God has always done, and hence what is abstractly fit that he should always do.