11 Now the Lord spoke to Moses in the Wilderness of Sinai, in the tabernacle of meeting, on the first day of the second month, in the second year after they had come out of the land of Egypt, saying: 2 "Take a census of all the congregation of the children of Israel, by their families, by their fathers' houses, according to the number of names, every male individually, 3 from twenty years old and above--all who are able to go to war in Israel. You and Aaron shall number them by their armies. 4 And with you there shall be a man from every tribe, each one the head of his father's house. 5 "These are the names of the men who shall stand with you: from Reuben, Elizur the son of Shedeur; 6 from Simeon, Shelumiel the son of Zurishaddai; 7 from Judah, Nahshon the son of Amminadab; 8 from Issachar, Nethanel the son of Zuar; 9 from Zebulun, Eliab the son of Helon; 10 from the sons of Joseph: from Ephraim, Elishama the son of Ammihud; from Manasseh, Gamaliel the son of Pedahzur; 11 from Benjamin, Abidan the son of Gideoni; 12 from Dan, Ahiezer the son of Ammishaddai; 13 from Asher, Pagiel the son of Ocran; 14 from Gad, Eliasaph the son of Deuel; [1] 15 from Naphtali, Ahira the son of Enan." 16 These were chosen from the congregation, leaders of their fathers' tribes, heads of the divisions in Israel.
17 Then Moses and Aaron took these men who had been mentioned by name, 18 and they assembled all the congregation together on the first day of the second month; and they recited their ancestry by families, by their fathers' houses, according to the number of names, from twenty years old and above, each one individually. 19 As the Lord commanded Moses, so he numbered them in the Wilderness of Sinai.
Matthew Henry's Commentary on Numbers 1:1-19
Commentary on Numbers 1:1-43
(Read Numbers 1:1-43)
The people were numbered to show God's faithfulness in thus increasing the seed of Jacob, that they might be the better trained for the wars and conquest of Canaan, and to ascertain their families in order to the division of the land. It is said of each tribe, that those were numbered who were able to go forth to war; they had wars before them, though now they met with no opposition. Let the believer be prepared to withstand the enemies of his soul, though all may appear to be peace.