Hebrews 8:4

For if indeed He were on earth, He would not be a priest, since there are priests who offer gifts according to the Law,

Numbers 16:40

a memorial to the sons of Israel, that no stranger not of the seed of Aaron may come near to offer incense before Jehovah, so that he may not be as Korah and as his company, as Jehovah said to him by the hand of Moses.

Numbers 17:12-13

And the sons of Israel spoke to Moses saying, Behold, we die, we perish, we all perish.

Numbers 18:5

And you shall keep the charge of the sanctuary and the charge of the altar, so that there may be no wrath any more upon the sons of Israel.

2 Chronicles 26:18-19

And they withstood Uzziah the king and said to him, It is not for you, Uzziah, to burn incense to the Lord, but to the priests, the sons of Aaron who are consecrated to burn incense. Go out of the temple, for you have sinned. Nor shall it be for your honor from Jehovah God.

Hebrews 5:1

For every high priest taken from among men is ordained for men in the things pertaining to God, so that he may offer both gifts and sacrifices for sins,

Hebrews 7:11-15

Therefore if perfection were by the Levitical priesthood (for under it the people received the Law), what further need was there that another priest should rise after the order of Melchizedek, and not be called after the order of Aaron?

Hebrews 11:4

By faith Abel offered to God a more excellent sacrifice than Cain, by which he obtained witness that he was righteous, 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
Therefore if perfection were by the Levitical priesthood (for under it the people received the Law), what further need was there that another priest should rise after the order of Melchizedek, and not be called after the order of Aaron?
Numbers 16:40
a memorial to the sons of Israel, that no stranger not of the seed of Aaron may come near to offer incense before Jehovah, so that he may not be as Korah and as his company, as Jehovah said to him by the hand of Moses.
Numbers 17:12
And the sons of Israel spoke to Moses saying, Behold, we die, we perish, we all perish.
Numbers 18:5
And you shall keep the charge of the sanctuary and the charge of the altar, so that there may be no wrath any more upon the sons of Israel.
2 Chronicles 26:18
And they withstood Uzziah the king and said to him, It is not for you, Uzziah, to burn incense to the Lord, but to the priests, the sons of Aaron who are consecrated to burn incense. Go out of the temple, for you have sinned. Nor shall it be for your honor from Jehovah God.

Gifts

Hebrews 11:4
By faith Abel offered to God a more excellent sacrifice than Cain, by which he obtained witness that he was righteous, God testifying of his gifts. And by it he, being dead, yet speaks.