Numbers 20:24-29

²⁴“Aaron will shortly join his forefathers in death. He will not enter the country I have given the Israelites, because you both disobeyed my command at the waters of Meribah.

²⁵Have Aaron and his son Eleazar join you and climb up Mount Hor together.

²⁶Take off Aaron's priestly clothes and put them on his son Eleazar. Aaron is going to die there and join his forefathers in death.”

²⁷Moses did as the Lord ordered: They climbed up Mount Hor in full view of all the Israelites.

²⁸Moses removed the priestly clothes that Aaron was wearing and put them on Aaron's son Eleazar. Aaron died there, on the top of the mountain. Then Moses and Eleazar went back down.

²⁹When the people realized that Aaron had died, they all mourned for him for thirty days.