Numbers 20:22-29

22And they removed from Kadesh; and the children of Israel, the whole assembly, came to mount Hor. 23And Jehovah spoke to Moses and to Aaron in mount Hor, on the border of the land of Edom, saying, 24Aaron shall be gathered unto his peoples; for he shall not enter into the land that I have given unto the children of Israel, because ye rebelled against my commandment at the waters of Meribah. 25Take Aaron and Eleazar his son, and bring them up unto mount Hor, 26and strip Aaron of his garments, and put them upon Eleazar his son; and Aaron shall be gathered [to his peoples], and shall die there. 27And Moses did as Jehovah had commanded, and they went up mount Hor before the eyes of the whole assembly. 28And Moses stripped Aaron of his garments, and put them upon Eleazar his son; and Aaron died there upon the top of the mountain; and Moses and Eleazar came down from the mountain. 29And the whole assembly saw that Aaron was dead, and they mourned for Aaron thirty days, [even] the whole house of Israel.