Numbers 1:17

1:17 So Moses and Aaron took these men who had been mentioned specifically by name,

Numbers 16:43

16:43 Then Moses and Aaron stood before the tent of meeting.

Numbers 20:25

20:25 Take Aaron and Eleazar his son, and bring them up on Mount Hor.

Numbers 33:39

33:39 Now Aaron was 123 years old when he died in Mount Hor.