Psalms 99:6

"Moses and Aaron among His priests, and Samuel among such as call upon His Name: these called upon the Lord, and He heard them" (ver. 6). "He spake unto them out of the cloudy pillar" (ver. 7). ...Of Moses it is not there stated that he was a priest. But if he was not this, what was he? Could he be anything greater than a priest? This Psalm declareth that he also was himself a priest: "Moses and Aaron among His priests." They therefore were the Lord's priests. Samuel is read of later in the Book of Kings: this Samuel is in David's times; for he anointed the holy David. Samuel from his infancy grew up in the temple. ...He mentioneth these: and by these desireth us to understand all the saints. Yet why hath he here named those? Because we said that we ought here to understand Christ. Attend, holy brethren. He said above, "O magnify the Lord our God: and fall down before His footstool, for He is holy:" praising some one, that is, our Lord Jesus Christ; whose footstool is to be worshipped, because He assumed flesh, in which He was to appear before the human race; and wishing to show unto us that the ancient fathers also had preached of Him, because our Lord Jesus Christ is Himself the True Priest, he mentioned these, because God spake unto them out of the cloudy pillar. What meaneth, "out of the cloudy pillar"? He was speaking figuratively. For if He spoke in some cloud, those obscure words predicted some one unknown, yet to be manifest. This unknown one is no longer unknown; for He is known by us, our Lord Jesus Christ. ...He who first spoke out of the cloudy pillar, hath in Person spoken unto us in His footstool; that is, on earth, when He had assumed the flesh, for which reason we worship His footstool, for He is holy. He Himself used to speak out of the cloud, which was not then understood: He hath spoken in His own footstool, and the words of His cloud have been understood. "They kept His testimonies, and the law that He gave them."

Moses and Aaron among his priests, and Samuel among those who call upon his name. Many err, and think that blessed Samuel was a priest. He was not a priest, he was a Levite. Finally, even his garment was not made as for a priest, but as for a Levite. For it is written: 'And his mother made for him,' it says, 'an ephod bad garment.' Ephod means garment, but bad means linen. Now, none had the linen garment except the Levites. But the priests of God had it of five kinds, that is, of gold, of hyacinth, of fine linen, of purple, of scarlet. Whoever, then, were of the priestly line had these garments. But the Levites had the ephod bad, that is, the linen garment. This very thing, then, is now said. Moses and Aaron among his priests, and Samuel among those who call upon his name. They are priests, this one is a Levite. Yet with God it is not rank that is sought, but works. Finally, what Moses did, Samuel also did. Just as Moses withstood God, that he should not strike the people, when he said to him: 'Let me alone, that I may strike this people.' See the power of Moses. What does God say to him? Let me alone: you do me violence, your prayers as it were hold me fast, your prayers restrain my hand. I send the arrow, I send the darts: and your prayers protect the people. Let me alone, that I may strike this people. And at the same time consider the mercy of God. When he says, Let me alone, he shows that if Moses does not let him alone, God does not strike. If, then, you do not let me alone, I will not strike: let me alone, and I will strike. In another manner, therefore, what does he say? Do not let me alone, and I will not strike. Let us see whether Samuel too did this very thing. We read in the books of Kingdoms that he stayed the wrath of God coming upon the people, since even in the time of the harvest he made rain and thunders and lightnings. And what, he says, is written there? 'And there came,' it says there, 'stones of hail, and they struck the Allophyli.' See how wise the fire, how wise the hail. Where Samuel was, the lightnings do not dare to come: for they see the prophet of God, they see the Levite. The hands of Samuel threatened the lightnings. He was praying, and the lightnings could not come. But why have I said all this? Because Moses and Aaron and Samuel, under different names, performed the same virtues. And let us bless the Lord: to whom be glory…