Aaron shall be gathered unto his people,.... That is, shall die, for this phrase is a periphrasis of death, and is used in common both of good and bad men, and designs death in general, without regard to persons and places men go to at death:

for he shall not enter into the land which I have given unto the children of Israel; the land of Canaan; and Aaron the priest, and so Moses the lawgiver, not being suffered to enter into that land, show the weakness and imperfection of the law, and of the Levitical priesthood, and the insufficiency of them, and of obedience to them to bring men to, and give them an entrance into the heavenly glory; that is done by another person, the antitype of Joshua, even Jesus:

because ye rebelled against my word at the water of Meribah; that is, you Moses and Aaron; their unbelief is called a rebelling against the word of the Lord, for which it was threatened them, that they should not bring the people of Israel into the land of Canaan, and now the threatening begins to take place, see Numbers 20:12.

Aaron shall be {l} gathered unto his people: for he shall not enter into the land which I have given unto the children of Israel, because ye rebelled against my word at the water of Meribah.

(l) Read Ge 25:8.

20:24 Because they rebelled - This was one but not the only reason. God would not have Moses and Aaron to carry the people into Canaan, for this reason also, to signify the insufficiency of the Mosaical law and Aaronical priesthood to make them perfectly happy, and the necessity of a better, and to keep the Israelites from resting in them, so as to be taken off from their expectation of Christ.

word: Heb. mouth

24-28. Aaron shall be gathered unto his people-In accordance with his recent doom, he, attired in the high priest's costume, was commanded to ascend that mountain and die. But although the time of his death was hastened by the divine displeasure as a punishment for his sins, the manner of his death was arranged in tenderness of love, and to do him honor at the close of his earthly service. His ascent of the mount was to afford him a last look of the camp and a distant prospect of the promised land. The simple narrative of the solemn and impressive scene implies, though it does not describe, the pious resignation, settled faith, and inward peace of the aged pontiff.

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?