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And Moses did as the LORD commanded: and they went up into mount Hor in the sight of all the congregation. And Moses stripped Aaron of his garments, and put them upon Eleazar his son; and Aaron died there in the top of the mount. Numbers 20:27-28And Aaron the priest went up into mount Hor at the commandment of the LORD, and died there. Numbers 33:38
And the children of Israel took their journey from Beeroth of the children of Jaakan to Mosera: there Aaron died, and there he was buried. Deuteronomy 10:6