5. over it--over "the ark of the covenant."
      cherubim--representing the ruling powers by which God acts in the moral and natural world. (See on Eze 1:6; Eze 10:1). Hence sometimes they answer to the ministering angels; but mostly to the elect redeemed, by whom God shall hereafter rule the world and set forth His manifold wisdom: redeemed humanity, combining in, and with itself, the highest forms of subordinate creaturely life; not angels. They stand on the mercy seat, and on that ground become the habitation of God, from which His glory is to shine upon the world. They expressly say, Re 5:8-10, "Thou hast redeemed us." They are there distinguished from the angels, and associated with the elders. They were of one piece with the mercy seat, even as the Church is one with Christ: their sole standing is on the blood-sprinkled mercy seat; they gaze down at it as the redeemed shall for ever; they are "the habitation of God through the Spirit."
      of glory--The cherubim were bearers of the divine glory, whence, perhaps, they derive their name. The Shekinah, or cloud of glory, in which Jehovah appeared between the cherubim over the mercy seat, the lid of the ark, is doubtless the reference. THOLUCK thinks the twelve loaves of the showbread represent the twelve tribes of the nation, presented as a community before God consecrated to Him (just as in the Lord's Supper believers, the spiritual Israel, all partaking of the one bread, and becoming one bread and one body, present themselves before the Lord as consecrated to Him, 1Co 10:16, 17); the oil and light, the pure knowledge of the Lord, in which the covenant people are to shine (the seven (lights), implying perfection); the ark of the covenant, the symbol of God's kingdom in the old covenant, and representing God dwelling among His own; the ten commandments in the ark, the law as the basis of union between God and man; the mercy seat covering the law and sprinkled with the blood of atonement for the collective sin of the people, God's mercy [in Christ] stronger than the law; the cherubim, the personified [redeemed] creation, looking down on the mercy seat, where God's mercy, and God's law, are set forth as the basis of creation.
      mercy seat--Greek, "the propitiatory": the golden cover of the ark, on which was sprinkled the blood of the propitiatory sacrifice on the day of atonement; the footstool of Jehovah, the meeting place of Him and His people.
      we cannot--conveniently: besides what met the eye in the sanctuary, there were spiritual realities symbolized which it would take too long to discuss in detail, our chief subject at present being the priesthood and the sacrifices. "Which" refers not merely to the cherubim, but to all the contents of the sanctuary enumerated in Heb 9:2-5.

JFB.