Ps 98:6

“"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."”