The place where they serve is a copy and shadow of what is in heaven. This is why Moses was warned when he was about to build the tabernacle: “See to it that you make everything according to the pattern shown you on the mountain.”
Textus Receptus (TR) - Hebrews 8:5 >οἵτινες ὑποδείγματι καὶ σκιᾷ λατρεύουσι τῶν ἐπουρανίων, καθὼς κεχρημάτισται Μωσῆς μέλλων ἐπιτελεῖν τὴν σκηνήν, Ὅρα, γάρ φησι, ποιήσῃς πάντα κατὰ τὸν τύπον τὸν δειχθέντα σοι ἐν τῷ ὄρει.