Hebrews 8:4

For if truly he were upon earth, he would not be a priest, there being priests bringing in gifts according to the law;

Numbers 16:40

A remembrance to the sons of Israel, so that a man, a stranger, shall not come near, he who is not from the seed of Aaron, to burn incense before Jehovah; and he shall not be as Korah and as his assembly: as Jehovah spake to him by the hand of Moses.

Numbers 17:12-13

And the sons of Israel will speak to Moses, saying, Behold, we expired, we perished, we all perished.

Numbers 18:5

And ye watched the watches of the holy place, and the watches of the altar; and anger shall no more be upon the sons of Israel.

2 Chronicles 26:18-19

And they will stand against Uzziah the king, and say to him, Not to thee, Uzziah, to burn incense to Jehovah, but to the priests, the sons of Aaron, being consecrated to burn incense: go forth from the holy place, for thou didst trespass; and not to thee for honor from Jehovah God.

Hebrews 5:1

For every chief priest taken from men is appointed for men for things to God, that he bring both gifts and sacrifices for sins:

Hebrews 7:11-15

If truly therefore completion were by the Levitical priesthood, (for the people received legislation by it,) what further need according to the order of Melchisedec for another priest to be raised, and not according to the order of Aaron?

Hebrews 11:4

By faith Abel brought near a greater sacrifice to God than Cain, by which he was testified of to be just, God testifying of his gifts; and by it he being dead yet speaks.

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 truly therefore completion were by the Levitical priesthood, (for the people received legislation by it,) what further need according to the order of Melchisedec for another priest to be raised, and not according to the order of Aaron?
Numbers 16:40
A remembrance to the sons of Israel, so that a man, a stranger, shall not come near, he who is not from the seed of Aaron, to burn incense before Jehovah; and he shall not be as Korah and as his assembly: as Jehovah spake to him by the hand of Moses.
Numbers 17:12
And the sons of Israel will speak to Moses, saying, Behold, we expired, we perished, we all perished.
Numbers 18:5
And ye watched the watches of the holy place, and the watches of the altar; and anger shall no more be upon the sons of Israel.
2 Chronicles 26:18
And they will stand against Uzziah the king, and say to him, Not to thee, Uzziah, to burn incense to Jehovah, but to the priests, the sons of Aaron, being consecrated to burn incense: go forth from the holy place, for thou didst trespass; and not to thee for honor from Jehovah God.

Gifts

Hebrews 11:4
By faith Abel brought near a greater sacrifice to God than Cain, by which he was testified of to be just, God testifying of his gifts; and by it he being dead yet speaks.