Commentaries:
Jamieson, Fausset, and Brown
Aaron shall number them by their armies—or companies. In their departure from Egypt they were divided into five grand companies (Exodus 13:18), but from the sojourn in the wilderness to the passage of the Jordan, they were formed into four great divisions. The latter is here referred to.
Other Jamieson, Fausset, and Brown entries containing Numbers 1:3:
Exodus 12:37
Numbers 1:1-2
Numbers 1:45-46
Numbers 3:14-31
Job 39:21
Ecclesiastes 8:8
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