Numbers 20:27-29

20:27 So Moses did as the Lord commanded; and they went up Mount Hor in the sight of the whole community. 20:28 And Moses removed Aaron’s garments and put them on his son Eleazar. So Aaron died there on the top of the mountain. And Moses and Eleazar came down from the mountain. 20:29 When all the community saw that Aaron was dead, the whole house of Israel mourned for Aaron thirty days.