Death of Aaron
Miriam had died earlier and now it was Aaron's turn to die.
Aaron did not enter the land because he rebelled against God's command at the waters of Meribah.
Eleazar the son of Aaron became the priest after Aaron died.
After Aaron had died Israel mourned for him thirty days.
The Death of Aaron
22 The whole Israelite community set out from Kadesh and came to Mount Hor. 23 At Mount Hor, near the border of Edom, the LORD said to Moses and Aaron, 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. 25 Get Aaron and his son Eleazar and take them up Mount Hor. 26 Remove Aaron's garments and put them on his son Eleazar, for Aaron will be gathered to his people; he will die there."
27 Moses did as the LORD commanded: They went up Mount Hor in the sight of the whole community. 28 Moses 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, the entire house of Israel mourned for him thirty days.