Numbers 20:28-29

Young's Literal Translation

²⁸ and Moses strippeth Aaron of his garments, and clotheth with them Eleazar his son, and Aaron dieth there on the top of the mount; and Moses cometh down -- Eleazar also -- from the mount,

²⁹ and all the company see that Aaron hath expired, and they bewail Aaron thirty days -- all the house of Israel.