Psalms 99:6

The happiness of Israel is made out by referring to the most useful governors of that people. They in every thing made God's word and law their rule, knowing that they could not else expect that their prayers should be answered. They all wonderfully prevailed with God in prayer; miracles were wrought at their request. They pleaded for the people, and obtained answers of peace. Our Prophet and High Priest, of infinitely greater dignity than Moses, Aaron, or Samuel, has received and declared to us the will of the Father. Let us not only exalt the Lord with our lips, but give him the throne in our heart; and while we worship him upon his mercy-seat, let us never forget that he is holy.

Moses and Aaron among his priests, and Samuel among them that call upon his name. Though not ordained to the typical priesthood, Moses was a true priest, even as Melchizedek had been before him. God has ever had a priesthood beside and above that of the law. The three holy men here mentioned all stood in his courts, and saw his holiness, each one after his own order. Moses saw the Lord in flaming fire revealing each perfect law, Aaron full often watched the sacred fire devour the sin-offering, and Samuel witnessed the judgment of the Lord on Eli's house, because of the error of his way. These each one stood in the gap when the wrath of God broke forth, because his holiness had been insulted; and acting as intercessors, they screened the nation from the great and terrible God, who otherwise would in a dreadful manner have executed judgment in Jacob. Let these men, or such as these, lead us in our worship, and let us approach the Lord at the mercy-seat as they did, for he is as accessible to us as to them. They made it their life's business to call upon him in prayer, and by so doing brought down innumerable blessings upon themselves and others. Does not the Lord call us also to come up into the mount with Moses, and to enter the most holy place with Aaron? Do we not hear him call us by our name as he did Samuel? And do we not answer, "Speak, Lord, for thy servant heareth"? They called upon the Lord, and he answered them. Not in vain were their prayers; but being a holy God he was true to his promises, and hearkened to them from off the mercy-seat. Here is reason for praise, for answers to the petitions of some are proofs of God's readiness to hear others. These three men asked large things, they pleaded for a whole nation, and they stayed great plagues and turned away fiery wrath; who would not exercise himself in adoring so great and merciful a God? If he were unholy he would be false to his word and refuse his people's cries; this, then, is recorded for our joy and for his glory, that holy men of old were not suffered to pray in vain.