Moses and Aaron took these men who had been named,
We have here the speedy execution of the orders given for the numbering of the people. It was begun the same day that the orders were given, The first day of the second month; compare Num 1:18 with Num 1:1. Note, When any work is to be done for God it is good to set about it quickly, while the sense of duty is strong and pressing.
Commenting on Numbers 1:17-43
And Moses and Aaron took these men,.... They doubtless sent for them, and acquainted them with the nomination of them, by the Lord himself, for such a service; and they took them with them to the place where the number of the people was to be taken: which are expressed by their names: in Num 1:16, and that as declared by the mouth of God himself.
Num 1:17-47 This command was carried out by Moses and Aaron. They took for this purpose the twelve heads of tribes who are pointed out (see at Lev 24:11) by name, and had the whole congregation gathered together by them and enrolled in genealogical tables. התילּד, to announce themselves as born, i.e., to have themselves entered in genealogical registers (books of generations).
Commenting on Numbers 1:17-47