Numbers 3:4

3:4 Nadab and Abihu died before the Lord when they offered strange fire before the Lord in the wilderness of Sinai, and they had no children. So Eleazar and Ithamar ministered as priests in the presence of Aaron their father.

Numbers 8:22

8:22 After this, the Levites went in to do their work in the tent of meeting before Aaron and before his sons. As the Lord had commanded Moses concerning the Levites, so they did.

Numbers 9:6

9:6 It happened that some men who were ceremonially defiled by the dead body of a man could not keep the Passover on that day, so they came before Moses and before Aaron on that day.

Numbers 17:10

The Memorial

17:10 The Lord said to Moses, “Bring Aaron’s staff back before the testimony to be preserved for a sign to the rebels, so that you may bring their murmurings to an end before me, that they will not die.”