Hebrews 12:22

are come--Greek, "have come near unto" (compare Deu 4:11). Not merely, ye shall come, but, ye have already come. Mount Sion--antitypical Sion, the heavenly Jerusalem, of which the spiritual invisible Church (of which the first foundation was laid in literal Zion, Joh 12:15; Pe1 2:6) is now the earnest; and of which the restored literal Jerusalem hereafter shall be the earthly representative, to be succeeded by the everlasting and "new Jerusalem, coming down from God out of heaven" (Rev. 21:2-27; compare Heb 11:10). to an innumerable company of angels, to the general assembly and church--The city of God having been mentioned, the mention of its citizens follows. Believers being like the angels (Job 1:6; Job 38:7), "sons of God," are so their "equals" (Luk 20:36); and being reconciled through Christ, are adopted into God's great and blessed family. For the full completion of this we pray (Mat 6:10). English Version arrangement is opposed: (1) by "and" always beginning each new member of the whole sentence; (2) "general assembly and Church," form a kind of tautology; (3) "general assembly," or rather, "festal full assembly," "the jubilant full company" (such as were the Olympic games, celebrated with joyous singing, dancing, &c.), applies better to the angels above, ever hymning God's praises, than to the Church, of which a considerable part is now militant on earth.

— Jamieson-Fausset-Brown Commentary (public domain)