Numbers 20:29
King James Version
“And when all the congregation saw that Aaron was dead, they mourned for Aaron thirty days, all the house of Israel.”
Context
26And strip Aaron of his garments, and put them upon Eleazar his son: and Aaron shall be gathered and shall die there.
27And Moses did as the LORD commanded: and they went up into mount Hor in the sight of all the congregation.
28And Moses stripped Aaron of his garments, and put them upon Eleazar his son; and Aaron died there in the top of the mount: and Moses and Eleazar came down from the mount.
29And when all the congregation saw that Aaron was dead, they mourned for Aaron thirty days, all the house of Israel.