19 These were the orderings of them in their service to come into the house of Jehovah, according to their ordinance, to Aaron their father, as Jehovah God of Israel had commanded him.
1 Chronicles 24:19 Cross References - LITV
1 Chronicles 9:25
25 And their brothers in their villages were to come in for seven days from time to time with them.
1 Chronicles 24:1
1 And these are the divisions of the sons of Aaron. The sons of Aaron were Nadab and Abihu, Eleazar and Ithamar.
2 Chronicles 23:4
4 This is what you shall do: the third of you going in on the sabbath, of the priests, and of the Levites, shall be keepers of the doors;
2 Chronicles 23:8
8 And the Levites and all Judah did according to all things that Jehoiada the priest had commanded. And every man took his men who were to come in on the sabbath, the ones who were to go out on the sabbath. For Jehoiada the priest did not dismiss the divisions.
1 Corinthians 14:40
40 And let all things be done decently and in order.
Hebrews 7:11
11 Truly, then, if perfection was through the Levitical priestly office (for the people had been given Law under it), why yet need for another priest to arise according to the order of Melchizedek and not to be called according to the order of Aaron?