There are several reasons that show why Aaron couldn’t enter the Promised Land:
1-Both Moses and Aaron’s lack of faith prevented them from entering the Promised Land. “And the LORD spake unto Moses and Aaron, Because ye believed me not, to sanctify me in the eyes of the children of Israel, therefore ye shall not bring this congregation into the land which I have given them” (Numbers 20:12).
2-Aaron built a golden calf for the Israelites to worship and much judgment came upon the people. “And the LORD plagued the people, because they made the calf, which Aaron made” (Exodus 32:35).
3-Aaron and Miriam both sinned because they spoke against God’s anointed leader Moses. “And Miriam and Aaron spake against Moses because of the Ethiopian woman whom he had married: for he had married an Ethiopian woman” (Numbers 12:1).
4- All the Israelites, except Moses, Joshua and Caleb, were guilty of murmuring against God when the 12 spies were sent to search out the Promised Land (Numbers 13). Aaron’s name was not mentioned alongside those that believed and were rewarded of not dying in the wilderness “So the Lord’s anger was aroused on that day, and He swore an oath, saying, Surely none of the men who came up from Egypt, from twenty years old and above, shall see the land of which I swore to Abraham, Isaac, and Jacob, because they have not wholly followed Me, except Caleb the son of Jephunneh, the Kenizzite, and Joshua the son of Nun, for they have wholly followed the Lord.’ So the Lord’s anger was aroused against Israel, and He made them wander in the wilderness forty years, until all the generation that had done evil in the sight of the Lord was gone” (Numbers 32:10-13).
In His service,