19 These [are] their appointments for their service, to come in to the house of Yahweh, according to their ordinance by the hand of Aaron their father, as Yahweh Elohim of Israel, commanded them.
1 Chronicles 24:19 Cross References - CLV
1 Chronicles 9:25
25 And their brethren in their villages [are] to come in for seven days from time to time with these.
1 Chronicles 24:1
1 And to the sons of Aaron [are] their courses:sons of Aaron [are] Nadab, and Abihu, Eleazar, and Ithamar,
2 Chronicles 23:4
4 `This [is] the thing that you do:The third of you, going in on the sabbath, of the priests, and of the Levites, [are] for gatekeepers of the thresholds,
2 Chronicles 23:8
8 And the Levites and all Judah do according to all that Jehoiada the priest has commanded, and take each his men going in on the sabbath, with those going out on the sabbath, for Jehoiada the priest has not let away the courses.
1 Corinthians 14:40
40 Yet let all occur respectably and in order.
Hebrews 7:11
11 If, indeed, then, perfection were through the Levitical priesthood (for the people have been placed under law with it), what need is there still for a different priest to arise according to the order of Melchizedek, and not said to be according to the order of Aaron?