Treasury of Scripture Knowledge

Summary

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.

Bible References

The orderings

1 Chronicles 9:25
And their brethren, who were in their villages, came every seven days in their set times with them.
2 Chronicles 23:4
This is the thing that ye must do: A third part of you, those who enter on the sabbath, shall be porters at the doors with the priests and the Levites;
1 Corinthians 14:40
But let all things be done decently and in order.

Under aaron

1 Chronicles 24:1
The sons of Aaron also had their courses. The sons of Aaron: Nadab, Abihu, Eleazar, and Ithamar.
Hebrews 7:11
If therefore perfection were by the Levitical priesthood (for under it the people received the law), what further need was there that another priest should rise after the order of Melchisedec and not be called after the order of Aaron?