1 Corinthians 14:40

but let all things be done decently and in order.

Hebrews 7:11

Now if perfection were by the Levitical priesthood, (for under it the people received the law) what farther need was there that another priest should arise after the order of Melchisedec, and not after the order 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 all things be done decently and in order.

Under aaron

Hebrews 7:11
Now if perfection were by the Levitical priesthood, (for under it the people received the law) what farther need was there that another priest should arise after the order of Melchisedec, and not after the order of Aaron?