1 Chronicles 24:19
These had as their appointed duty in their service to come into the house of the LORD according to the procedure established for them by Aaron their father, as the LORD God of Israel had commanded him.
1 Chronicles 9:25
And their kinsmen who were in their villages were obligated to come in every seven days, in turn, to be with these,
1 Chronicles 24:1
The divisions of the sons of Aaron were these. The sons of Aaron: Nadab, Abihu, Eleazar, and Ithamar.
2 Chronicles 23:4
This is the thing that you shall do: of you priests and Levites who come off duty on the Sabbath, one third shall be gatekeepers
2 Chronicles 23:8
The Levites and all Judah did according to all that Jehoiada the priest commanded, and they each brought his men, who were to go off duty on the Sabbath, with those who were to come on duty on the Sabbath, for Jehoiada the priest did not dismiss the divisions.
1 Corinthians 14:40
But all things should be done decently and in order.
Hebrews 7:11
Now if perfection had been attainable through the Levitical priesthood (for under it the people received the law), what further need would there have been for another priest to arise after the order of Melchizedek, rather than one named after the order of Aaron?