A month had passed away since the setting up of the tabernacle Exo 40:2, Exo 40:17 : and the Sinaitic legislation was now complete (compare Lev 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 Exo 30:11, etc.; Exo 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 Num 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 Exo 38:21 and note), but by Num 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.