Commentaries:
Barnes' Notes
For if he were on earth, he should not be a priest - He could not perform that office. The design of this is, to show a reason why he was removed to heaven. The reason was, that on earth there were those who were set apart to that office, and that he, not being of the same tribe with them, could not officiate as priest. There was an order of people here on earth consecrated already to that office, and hence, it was necessary that the Lord Jesus, in performing the functions of the office, should be removed to another sphere.
Other Barnes' Notes entries containing Hebrews 8:4:
Matthew 20:20-28
Hebrews 8:13
Revelation 11:19
DISCLAIMER: Church of the Great God (CGG) provides these resources to aid the individual in studying the Bible. However, it is up to the individual to "prove all things, and hold fast to that which is good" (I Thessalonians 5:21). The content of these resources does not necessarily reflect the views of CGG. They are provided for information purposes only.