Hebrews 8:4

Were he on earth, he would not be a priest at all, for there are priests already to offer the gifts prescribed by Law

Hebrews 5:1

Every high priest who is selected from men and appointed to act on behalf of men in things divine, offering gifts and sacrifices for sins,

Hebrews 7:11-15

Further, if the Levitical priesthood had been the means of reaching perfection (for it was on the basis of that priesthood that the Law was enacted for the People), why was it still necessary for another sort of priest to emerge with the rank of Melchizedek, instead of simply with the rank of Aaron

Hebrews 11:4

It was by faith that Abel offered God a richer sacrifice than Cain did, and thus won from God the record of being 'just,' on the score of what he gave; he died, but by his faith he is speaking to us still.

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:

He should

Gifts

Bible References

He should

Hebrews 7:11
Further, if the Levitical priesthood had been the means of reaching perfection (for it was on the basis of that priesthood that the Law was enacted for the People), why was it still necessary for another sort of priest to emerge with the rank of Melchizedek, instead of simply with the rank of Aaron

Gifts

Hebrews 11:4
It was by faith that Abel offered God a richer sacrifice than Cain did, and thus won from God the record of being 'just,' on the score of what he gave; he died, but by his faith he is speaking to us still.