Numbers 20:24-29

24“Aaron will be gathered to his people. He will not enter the land I give the Israelites, because both of you rebelled against my command at the waters of Meribah. 25Get Aaron and his son Eleazar and take them up Mount Hor. 26Remove Aaron’s garments and put them on his son Eleazar, for Aaron will be gathered to his people; he will die there.” 27Moses did as the Lord commanded: They went up Mount Hor in the sight of the whole community. 28Moses removed Aaron’s garments and put them on his son Eleazar. And Aaron died there on top of the mountain. Then Moses and Eleazar came down from the mountain, 29and when the whole community learned that Aaron had died, all the Israelites mourned for him thirty days.