Ellicott's Commentary for English Readers - Hebrews 8:5
(5) Who serve unto . . .—Better, men who serve a copy and shadow of the heavenly things. So in Hebrews 13:10 we read of those who “serve the tabernacle.” On the connection of thought, see Hebrews 8:3. “Copy,” not in the sense of perfect resemblance, but rather a token suggesting and designed to suggest the original. (See Note on Hebrews 9:23, where the same word is used.) “Shadow,” as the shadow has no substance or independent existence, but represents only the outline of an object. (Comp.... read more
Ellicott's Commentary for English Readers - Hebrews 8:4
(4) For if he were . . .—The oldest Greek MSS. and two important versions read, “If then He were”; and two other changes in the text of this verse also rest on high authority. In its correct form the verse will stand thus: If then He were on earth, He would not even be a priest (that is, He would not be a priest at all), seeing there are those who according to law offer the gifts. The argument somewhat resembles that of Hebrews 7:13-14; there, however, the impediment is that of tribe; here the... read more