25 Take Aaron and Eleazar his son, and bring them up unto mount Hor, 26 and strip Aaron of his garments, and put them upon Eleazar his son; and Aaron shall be gathered [to his peoples], and shall die there. 27 And Moses did as Jehovah had commanded, and they went up mount Hor before the eyes of the whole assembly. 28 And Moses stripped Aaron of his garments, and put them upon Eleazar his son; and Aaron died there upon the top of the mountain; and Moses and Eleazar came down from the mountain. 29 And the whole assembly saw that Aaron was dead, and they mourned for Aaron thirty days, [even] the whole house of Israel.
Matthew Henry's Commentary on Numbers 20:25-29
Commentary on Numbers 20:22-29
(Read Numbers 20:22-29)
God bids Aaron prepare to die. There is something of displeasure in these orders. Aaron must not enter Canaan, because he had failed in his duty at the waters of strife. There is much of mercy in them. Aaron, though he dies for his transgression, dies with ease, and in honour. He is gathered to his people, as one who dies in the arms of Divine grace. There is much significancy in these orders. Aaron must not enter Canaan, to show that the Levitical priesthood could make nothing perfect; that must be done by bringing in a better hope. Aaron submits, and dies in the method and manner appointed; and, for aught that appears, with as much cheerfulness as if he had been going to bed. It was a great satisfaction to Aaron to see his son, who was dear to him, preferred; and his office preserved and secured: especially, to see in this a figure of Christ's everlasting priesthood. A good man would desire, if it were the will of God, not to outlive his usefulness. Why should we covet to continue any longer in this world, than while we may do some service in it for God and our generation?