John Calvin on Numbers 20:29

29. And when all the congregation saw. This has been an error common to almost all nations and ages, but which reigned peculiarly amongst the people of Israel — to pay due honor to God’s holy servants, rather after their deaths than in their lives. They had frequently wished to stone Aaron; they had raised great tumults, in order to cast him down from the dignity in which God had placed him; now, forgetting their malignity and envy, they lament for him when dead.

The question, however, occurs, whether the mourning for a month, which is here recorded, was praiseworthy or not? But it could not be otherwise than improper, inasmuch as it was a means of aggravating their grief; for men are naturally only too much inclined to excessive grief, even although they do not indulge it; and besides, the hope of a better life avails to mitigate sorrow. Hence we infer, that those are endued with scarcely any taste of eternal salvation, who give way to immoderate grief. But, since believers have another cause for mourning, i.e., to exercise themselves both in the fear of God, and in the hope and desire of the future resurrection, this solemn mourning has not been unreasonably received as a general custom. Since death is a mirror of God’s curse upon the whole human race, it is profitable for us, whenever any of our belongings dies, to mourn our common lot, so as to humble ourselves beneath God’s hand. Besides, if mourning is directed to its proper end, it in a manner unites the living with the dead; so that in death itself the communion of the new and immortal life shines forth. And further, the weakness of the ancient people had need of being propped and supported by such aids as this; for, amidst their dark shadows, it would not have been easy to rise above the world, unless they had been taught that the dead still belonged to them, and that there remained some bond of connection between them. But if the utility (of this custom) be corrupted by its abuse, it is not just that what is right in itself should be blamed for the fault of men.

A Repetition of the same History

Numbers 33

Numbers 33:38, 39

38. And Aaron the priest went up into mount Hor, at the commandment of the Lord, and died there, in the fortieth year after the children of Israel were come out of the land of Egypt, in the first day of the fifth month.

38. Ascendit autem Aharon sacerdos in Hor montem secundum sermonem Jehovae: et mortuus est ibi anno quadragesimo ex quo egressi sunt filii Israel e terra AEgypti, mense quinto, primo die mensis.

39. And Aaron was an hundred and twenty and three years old when he died in mount Hor.

39. Erat Aharon natus centum ac viginti tres annos quando mortuus est in Hor monte.