18 And they assembled all the congregation together on the first day of the second month; and they declared their pedigrees after their families, by their fathers' houses, according to the number of the names, from twenty years old and upward, by their polls.

Matthew Henry's Commentary on Numbers 1:18

Commentary on Numbers 1:1-43

(Read Numbers 1:1-43)

The people were numbered to show God's faithfulness in thus increasing the seed of Jacob, that they might be the better trained for the wars and conquest of Canaan, and to ascertain their families in order to the division of the land. It is said of each tribe, that those were numbered who were able to go forth to war; they had wars before them, though now they met with no opposition. Let the believer be prepared to withstand the enemies of his soul, though all may appear to be peace.