Numbers 8:21
8:21 The Levites purified themselves and washed their clothing; then Aaron presented them like a wave offering before the Lord, and Aaron made atonement for them to purify them.
Numbers 20:26
20:26 Remove Aaron’s priestly garments and put them on Eleazar his son, and Aaron will be gathered to his ancestors and will die there.”
Numbers 20:29
20:29 When all the community saw that Aaron was dead, the whole house of Israel mourned for Aaron thirty days.