The writer again referred to the heavens where God abides and where Jesus Christ now serves as the real tabernacle, the only one that does not imitate something better than itself. In particular, the holy of holies is in view. These verses summarize what follows in chapter8. [1][source]
"The throne He occupies and from which He ministers is not David"s throne, which He will one day occupy here on earth as the promised Messiah ( Matthew 25:31). Rather, He was identified with the throne of "the Majesty in the heavens." The authority assigned to the One so enthroned was to be "a minister of the sanctuary and of the true tabernacle" ( Hebrews 8:2). Thus He was not appointed to be a king in an earthly domain, but rather He was appointed to function as a High priest in a new sanctuary. And the appointment as High Priest, according to Psalm 110:4, follows the enthronement of Christ at His Father"s right hand." [1][source]
We not only have a high priest who has taken His seat at the Father"s right hand ( Hebrews 8:1), but we have one who now ministers as a priest in the heavenly sanctuary ( Hebrews 8:2; cf. Psalm 110:1). [source][source][source]
"There are other sons beside the Son ( Hebrews 2:10), but no other priests subordinated to Christ as high priest." [3][source]