Chapter 24 presents, also as under David's ordering—no longer of Moses— the highest character of blessing found in the Old Testament, and typical, too, of the highest character of blessing expressed as to heavenly things in the New Testament the priestly position. (See Revelation 5:10, 1 Peter 2:5, 9; Hebrews 10:19-22; Revelation 22:16).
The twenty four courses of priests (verses 7-19) ceased to function when Nebuchadnezzar carried Judah and Benjamin away, but were restored in Ezra's day (Ezra 6:18), and still going on when the Lord partook of flesh and blood (Matthew 1:5, etc.—Abia, verse 7, doubtless being Abijah mentioned in 1 Chronicles 24:10).
The twenty four elders of Revelation 4 and 5 seem to plainly express the completeness of the heavenly body of priests, there including every believer.