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The enrollment, being taken primarily for military purposes (compare Numbers 1:3, Numbers 1:20), would naturally be arranged by hundreds…

Those that were numbered of them, [even] of the tribe of Benjamin, [were] thirty and five thousand and four hundred . 35,…

The people were numbered to show God's faithfulness in so increasing the seed of Jacob, so that they might be better trained for the wars and conqu…
Albert Barnes
AlbertBarnes