In one year, three tzaddikim died — Moses, Aaron and Miriam, viz. (Zechariah 11:8) "And I lost the three shepherds in one month." Now did they die in one month? Did they not die in one year? But (the resolution is:) When Miriam died, the well was removed, and it returned in the merit of Moses and Aaron.
When Aaron died, the pillar of cloud was removed, and both returned in the merit of Moses. When Moses died, the three were removed and did not return. At that time Israel was "naked" of everything," viz. (Song of Songs 8:8) "We have a little sister and she has no breasts." After Moses, there was no consolation for Israel.
When Aaron died, all of Israel gathered to Moses and said to him "Where is Aaron your brother?" He answered: "G-d has secreted him for eternal life." They did not believe him and said to him: "We know you to be brusque. Maybe he said something objectionable and you imposed death upon him."
What did the Holy One Blessed be He do? He took Aaron's litter and suspended it in the heaven of heavens, and the Holy One Blessed be He eulogized him, and the ministering angels answered after Him. And what did they say (Malachi 2:6) "The Torah of truth was in his mouth, and wrong was not found on his lips. In peace and uprightness did he walk with Me and many did he turn from sin."