Commentaries:
Barnes' Notes
A month had passed away since the setting up of the tabernacle Exodus 40:2, Exodus 40:17 : and the Sinaitic legislation was now complete (compare Leviticus 27:34).
A census ("sum" ) was commanded, to be based not upon any fresh registration of individuals, but upon that which had accompanied the previous collection of the offerings. Compare Exodus 30:11, etc.; Exodus 38:25-28. The offerings had been probably tendered by the people in groups, and if certificates of registration were furnished to such groups, the new census might be easily carried out by means of these documents, and got through Numbers 1:18 in a single day. The present registration enrolled persons "after their families, by the house of their fathers;" and was superintended not by the Levites (see Exodus 38:21 and note), but by Numbers 1:4 an assessor for each tribe to act in the business with Moses and Aaron. The purpose now in view was not religious only. The census now taken would serve as a basis for various civil and military arrangements.
Other Barnes' Notes entries containing Numbers 1:1:
Exodus 30:11-16
Numbers 9:1-5
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