1 Corinthians 14:40

But let everything be done in a proper and orderly way.

Hebrews 7:11

Now if anything final had been really accomplished through the Levitical priesthood, for even the giving of the Law was based upon it, what further need would there have been of appointing a different priest of the priesthood of Melchizedek, instead of choosing one of the priesthood of Aaron?

Treasury of Scripture Knowledge

Summary

These were the orderings of them in their service to come into the house of the LORD, according to their manner, under Aaron their father, as the LORD God of Israel had commanded him.

The orderings

Under aaron

Bible References

The orderings

1 Corinthians 14:40
But let everything be done in a proper and orderly way.

Under aaron

Hebrews 7:11
Now if anything final had been really accomplished through the Levitical priesthood, for even the giving of the Law was based upon it, what further need would there have been of appointing a different priest of the priesthood of Melchizedek, instead of choosing one of the priesthood of Aaron?