1 Chronicles 24:19

These were their offices for their ministry when they came in to the house of the Lord according to the ordinance given to them through Aaron their father, just as the Lord God of Israel had commanded him.

1 Chronicles 9:25

Their relatives in their villages were to come in every seven days from time to time to be with them;

1 Chronicles 24:1

Now the divisions of the descendants of Aaron were these: the sons of Aaron were Nadab, Abihu, Eleazar and Ithamar.

2 Chronicles 23:4

This is the thing which you shall do: one third of you, of the priests and Levites who come in on the sabbath, shall be gatekeepers,

2 Chronicles 23:8

So the Levites and all Judah did according to all that Jehoiada the priest commanded. And each one of them took his men who were to come in on the sabbath, with those who were to go out on the sabbath, for Jehoiada the priest did not dismiss any of the divisions.

1 Corinthians 14:40

But all things must be done properly and in an orderly manner.

Hebrews 7:11

Now if perfection was through the Levitical priesthood (for on the basis of it the people received the Law), what further need was there for another priest to arise according to the order of Melchizedek, and not be designated according to the order of Aaron?

Treasury of Scripture Knowledge

Summary

1 Chronicles 24:19

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

1 Chronicles 9:25

2 Chronicles 23:4

1 Corinthians 14:40

Under aaron

1 Chronicles 24:1

Hebrews 7:11

Bible References