Observe here, 1. That Moses did not number the people but when God commanded him. David in his time did it without a command, and paid dearly for it. God was Israel's king, and he would not have this act of authority done but by his express orders. Moses, perhaps, by this time, had heard of the blessing with which Balaam was constrained, sorely against his will, to bless Israel, and particularly the notice he took of their numbers; and he was sufficiently pleased with that general testimony borne to this instance of their strength and honour by an adversary, though he knew not their numbers exactly, till God now appointed him to take the sum of them. 2. Eleazar was joined in commission with him, as Aaron had been before, by which God honoured Eleazar before the elders of his people, and confirmed his succession. 3. It was presently after the plague that this account was ordered to be taken, to show that though God had in justice contended with them by that sweeping pestilence, yet he had not made a full end, nor would he utterly cast them off. God's Israel shall not be ruined, though it be severely rebuked. 4. They were now to go by the same rule that they had gone by in the former numbering, counting those only that were able to go forth to war, for this was the service now before them.

Take the sum of the people, from twenty years old and upward,.... At the same age at which the sum was taken before, Num 1:3 so that there could not be one that was more than sixty years of age, of all those that went into the land of Canaan, except Joshua and Caleb, and besides some few in the tribe of Levi, which did not come into either of these musters:

and the Lord commanded Moses, and the children of Israel, which went forth out of the land of Egypt; as Moses had a command to number the people before, so he had now. The sin of David was, that he numbered the people when he had no command for it; Moses, when he brought the people out of Egypt, had them committed to him by number; and now being about to die, he delivers them up as it were by number again, as Jarchi observes.

Take the sum of all the congregation--The design of this new census, after a lapse of thirty-eight years, was primarily to establish the vast multiplication of the posterity of Abraham in spite of the severe judgments inflicted upon them; secondarily, it was to preserve the distinction of families and to make arrangements, preparatory to an entrance into the promised land, for the distribution of the country according to the relative population of the tribes.