19 This was the ordering of them in their service, to come into the house of the LORD according to the ordinance [given] unto them by the hand of Aaron their father, as the LORD, the God of Israel, had commanded him.
1 Chronicles 24:19 Cross References - ERV
1 Chronicles 9:25
25 And their brethren, and their villages, were to come in every seven days from time to time to be with them:
1 Chronicles 24:1
1 And the courses of the sons of Aaron [were these]. The sons of Aaron; Nadab and Abihu, Eleazar and Ithamar.
2 Chronicles 23:4
4 This is the thing that ye shall do: a third part of you, that come in on the sabbath, of the priests and of the Levites, shall be porters of the doors;
2 Chronicles 23:8
8 So the Levites and all Judah did according to all that Jehoiada the priest commanded: and they took every man his men, those that were to come in on the sabbath, with those that were to go out on the sabbath; for Jehoiada the priest dismissed not the courses.
1 Corinthians 14:40
40 But let all things be done decently and in order.
Hebrews 7:11
11 Now if there was perfection through the Levitical priesthood (for under it hath the people received the law), what further need [was there] that another priest should arise after the order of Melchizedek, and not be reckoned after the order of Aaron?