So were all those that were numbered of the children of Israel, by the house of their fathers, from twenty years old and upward, all that were able to go forth to war in Israel;

Jamieson-Fausset-Brown Bible Commentary

45, 46. all they that were numbered were six hundred thousand, &c.-What an astonishing increase from seventy-five persons who went down to Egypt about two hundred fifteen years before [see on [52]Ge 46:8], and who were subjected to the greatest privations and hardships! And yet this enumeration was restricted to men from twenty years and upwards [Nu 1:3]. Including women, children, and old men, together with the Levites, the whole population of Israel, on the ordinary principles of computation, amounted to about 2,400,000.

Matthew Henry's Concise Commentary

1:44-46 We have here the sum total. How much was required to maintain all these in the wilderness! They were all provided for by God every day. When we observe the faithfulness of God, however unlikely the performance of his promise may appear, we may take courage as to those which yet remain to be fulfilled to the church of God.

Matthew Henry's Whole Bible Commentary

Verses 44-46

We have here the sum total at the foot of the account; they were in all 600,000 fighting men, and 3550 over. Some think that when this was their number some months before (Ex. 38:26) the Levites were reckoned with them, but now that tribe was separated for the service of God, yet so many more had by this time attained to the age of twenty years as that still they were the same number, to show that whatever we part with for the honour and service of God it shall certainly be made up to us one way of other. Now we see what a vast body of men they were. Let us consider, 1. How much went to maintain all these (besides twice as many more, no question, of women and children, sick and aged, and the mixed multitude) for forty years together in the wilderness; and they were all at God's finding every day, having their food from the dew of heaven, and not from the fatness of the earth. O what a great and good housekeeper is our God, that has such numbers depending on him and receiving from him every day! 2. What work sin makes with a people; within forty years most of them would indeed have died of course for the common sin of mankind; for, when sin entered into the world, death came with it, and how great are the desolations which it makes in the earth! But, for the particular sin of unbelief and murmuring, all those that were now numbered, except two, laid their bones under their iniquity, and perished in the wilderness. 3. What a great multitude God's spiritual Israel will amount to at last; though at one time, and in one place, they seem to be but a little flock, yet when they come all together they shall be a great multitude, innumerable, Rev. 7:9. And, though the church's beginning be small, its latter end shall greatly increase. A little one shall become a thousand.