Hebrews 8:4

If he were on earth, he would not be a priest, for there are those who offer the gifts according to the Law.

Numbers 16:40

He followed Jehovah's command given through Moses. The copper-covered altar will remind Israel that no one but a descendant of Aaron may come near to burn incense to Jehovah. Everyone else will die like Korah and his followers.

Numbers 17:12-13

The Israelites said to Moses: Now we are going to die! We will perish! We are all lost!

Numbers 18:5

You and your sons alone must fulfill the responsibilities for the Holy Place and the altar. That way my anger will not again break out against the people of Israel.

2 Chronicles 26:18-19

They opposed King Uzziah. They said to him: Uzziah, you have no right to burn incense as an offering to Jehovah. That right belongs to the priests, Aaron's descendants, who have been given the holy task of burning incense. Get out of the holy place because you have been unfaithful. Jehovah God will not honor you for this.

Hebrews 5:1

Every high priest taken from among men is appointed in behalf of men in things relating to God. He may offer both gifts and sacrifices for sins.

Hebrews 7:11-15

If perfection had been attainable through the Levitical priesthood, for under it the people received the Law, what further need would there have been for another priest to arise after the order of Melchizedek, instead of one named after the order of Aaron?

Hebrews 11:4

By faith Abel offered to God a more excellent sacrifice than Cain. Through this he was commended as righteous. God testified about his gifts. Thus through faith he still speaks even though he is dead.

Treasury of Scripture Knowledge

Summary

For if he were on earth, he should not be a priest, seeing that there are priests that offer gifts according to the law:

Gifts

Bible References

He should

Hebrews 7:11
If perfection had been attainable through the Levitical priesthood, for under it the people received the Law, what further need would there have been for another priest to arise after the order of Melchizedek, instead of one named after the order of Aaron?
Numbers 16:40
He followed Jehovah's command given through Moses. The copper-covered altar will remind Israel that no one but a descendant of Aaron may come near to burn incense to Jehovah. Everyone else will die like Korah and his followers.
Numbers 17:12
The Israelites said to Moses: Now we are going to die! We will perish! We are all lost!
Numbers 18:5
You and your sons alone must fulfill the responsibilities for the Holy Place and the altar. That way my anger will not again break out against the people of Israel.
2 Chronicles 26:18
They opposed King Uzziah. They said to him: Uzziah, you have no right to burn incense as an offering to Jehovah. That right belongs to the priests, Aaron's descendants, who have been given the holy task of burning incense. Get out of the holy place because you have been unfaithful. Jehovah God will not honor you for this.

Gifts

Hebrews 11:4
By faith Abel offered to God a more excellent sacrifice than Cain. Through this he was commended as righteous. God testified about his gifts. Thus through faith he still speaks even though he is dead.