Numbers 20:22-29

²²And they journeyed from Kadesh, and the people of Israel, the whole congregation, came to Mount Hor. ²³And the LORD said to Moses and Aaron at Mount Hor, on the border of the land of Edom, ²⁴"Aaron shall be gathered to his people; for he shall not enter the land which I have given to the people of Israel, because you rebelled against my command at the waters of Mer'ibah. ²⁵Take Aaron and Elea'zar his son, and bring them up to Mount Hor; ²⁶and strip Aaron of his garments, and put them upon Elea'zar his son; and Aaron shall be gathered to his people, and shall die there." ²⁷Moses did as the LORD commanded; and they went up Mount Hor in the sight of all the congregation. ²⁸And Moses stripped Aaron of his garments, and put them upon Elea'zar his son; and Aaron died there on the top of the mountain. Then Moses and Elea'zar came down from the mountain. ²⁹And when all the congregation saw that Aaron was dead, all the house of Israel wept for Aaron thirty days.