The chapter began with the funeral of Miriam, and it ends with the funeral of her brother Aaron. When death comes into a family, it often strikes double. Israel had not improved the former affliction they were under, by the death of the prophetess, and therefore, soon after, God took away their priest, to try if they would lay that to heart. This happened at the very next stage, when they removed to Mount Hor, fetching a compass round the Edomites' country, leaving it on their left hand. Wherever we go, death attends us, and the graves are ready for us.
I. God bids Aaron die, Num 20:24. God takes Moses and Aaron aside, and tells them, Aaron shall be gathered to his people. These two dear brothers are told that they must part. Aaron the elder must die first, but Moses is not likely to be long after him; so that it is but for a while, a little while, that they are parted. 1. 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. The mention of this, no doubt, went to the heart of Moses, who knew himself, perhaps, at that time, to be the guiltier of the two. 2. There is much of mercy in them. Aaron, though he dies for his transgression, is not put to death as a malefactor, by a plague, or fire from heaven, but dies with ease and in honour. He is not cut off from his people, as the expression usually is concerning those that die by the hand of divine justice, but he is gathered to his people, as one that died in the arms of divine grace. 3. There is much of type and significancy in them. Aaron must not enter Canaan, to show that the Levitical priesthood could make nothing perfect: that must be done by the bringing in of a better hope. Those priests could not continue by reason of sin and death, but the priesthood of Christ, being undefiled, is unchangeable, and to this, which abides for ever, Aaron must resign all his honour, Heb 7:23-25.
II. 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.
1. He puts on his holy garments to take his leave of them, and goes up with his brother and son to the top of Mount Hor, and probably some of the elders of Israel with him, Num 20:27. They went up in the sight of all the congregation, who, it is likely, were told on what errand they went up; by this solemn procession Aaron lets Israel know that he is neither afraid nor ashamed to die, but, when the bridegroom comes, can trim his lamp and go forth to meet him. His going up the hill to die signified that the death of saints (and Aaron is called the saint of the Lord) is their ascension; they rather go up than go down to death.
2. Moses, whose hands had first clothed Aaron with his priestly garments, now strips him of them; for, in reverence to the priesthood, it was not fit that he should die in them. Note, Death will strip us; naked we came into the world, and naked we must go out. We shall see little reason to be proud of our clothes, our ornaments, or marks of honour, if we consider how soon death will strip us of our glory, divest us of all our offices and honours, and take the crown off from our head.
3. Moses immediately puts the priestly garments upon Eleazar his son, clothes him with his father's robe, and strengthens him with his girdle, Isa 22:21. Now, (1.) This was a great comfort to Moses, by whose hand the law of the priesthood was given to see that it should be kept up in a succession, and that a lamp was ordained for the anointed, which should not be extinguished by death itself. This was a happy earnest and indication to the church of the care God would take that as one generation of ministers and Christians (spiritual priests) passes away another generation should come up instead of it. (2.) It was a great satisfaction to Aaron to see his son, who was dear to him, thus preferred, and his office, which was dearer, thus preserved and secured, and especially to see in this a figure of Christ's everlasting priesthood, in which alone his would be perpetuated. Now, Lord, might Aaron say, let thy servant depart in peace, for my eyes have seen thy salvation. (3.) It was a great kindness to the people. The installing of Eleazar before Aaron was dead would prevent those who bore ill-will to Aaron's family from attempting to set up another upon his death, in competition with his son. What could they do when the matter was already settled? It would likewise encourage those among them that feared God, and be a token for good to them, that he would not leave them, nor suffer his faithfulness to fail.
4. Aaron died there. Quickly after he was stripped of his priestly garments, he laid himself down and died contentedly; for 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 God and our generation some service in it?
5. Moses and Eleazar, with those that attended them, buried Aaron where he died, as appears by Deu 10:6, and then came down from the mount. And now, when they came down, and had left Aaron behind, it might be proper for them to think that he had rather gone up to the better world and had left them behind.
6. All the congregation mourned for Aaron thirty days, Num 20:29. Though the loss was well made up in Eleazar, who, being in the prime of life, was fitter from public service that Aaron would have been if he had lived, yet it was a debt owing to their deceased high priest to mourn for him. While he lived, they were murmuring at him upon all occasions, but now that he was dead they mourned for him. Thus many are taught to lament the loss of those mercies which they would not learn to be thankful for the enjoyment of. Many good men have had more honour done to their memories than ever they had to their persons, witness those that were persecuted while they lived, but when they were dead had their sepulchres garnished.

And Moses stripped Aaron of his garments,.... His priestly garments, which, very probably, were put on at the foot of the mountain, on purpose for the transaction of this affair, since they were not in common worn, but only when in service; the same hands that clothed Aaron with them at first, stripped him of them, and both were done at the command of God; as the stripping of those garments was a divesting Aaron of his office, so it was a figure of the disannulling of his priesthood, when the Messiah should come, a priest after another order:

and put them upon Eleazar his son; which was an investing him with the office of high priest in his father's room; and which, as it must give Aaron pleasure and satisfaction to see his son put into his office before he died, so it signified the continuance of it in succession in his posterity, and was a confirmation of it; and it must be pleasing to Moses and the people of Israel to observe the care and faithfulness of God in providing for the succession of the priesthood:

and Aaron died there in the top of the mount; quietly, comfortably, and contentedly, without the least murmuring or repining: this was on the first day of the fifth month, as appears from Num 33:38, that is, of the month Ab, as the Targum of Jonathan here says; and in this the Jewish writers (k) agree in general, which month answers to part of July and part of August; and in this same place where he died he was buried, as is evident from Deu 10:6, wherefore no credit is to be given to the Arabs, who show a stone not far from Mount Sinai, about two feet high from the ground, on which are seen some unknown characters, which, they say, were engraven by Jeremiah the prophet, in honour of Moses and Aaron, who were buried there (l):

and Moses and Eleazar came down from the mount; after Aaron was dead and buried.

(k) Seder Olam Rabba, c. 10. p. 29. Shalshalet Hakabala, fol. 7. 2. Schulchan Aruch, par. 1. c. 580. sect. 2. (l) Journal from Cairo to Mount Sinai, p. 40. Ed. 2.

strip Aaron of his garments--that is, his pontifical robes, in token of his resignation. (See Isa 22:20-25).

put them on his son--as the inauguration into his high office. Having been formerly anointed with the sacred oil, that ceremony was not repeated, or, as some think, it was done on his return to the camp.