3 From twenty years old and upward, all that are able to go forth to war in Israel: you and Aaron shall number them by their armies.
Numbers 1:3 Cross References - KJ2000
Exodus 12:17
17 And you shall observe the feast of unleavened bread; for in this very same day have I brought your armies out of the land of Egypt: therefore shall you observe this day in your generations by an ordinance forever.
Exodus 30:14
14 Every one included among them that are numbered, from twenty years old and above, shall give an offering unto the LORD.
Numbers 14:29
29 Your carcasses shall fall in this wilderness; and all that were numbered of you, according to your whole number, from twenty years old and upward, who have murmured against me,
Numbers 26:2
2 Take the sum of all the congregation of the children of Israel, from twenty years old and upward, throughout their fathers' house, all that are able to go to war in Israel.
Numbers 32:11
11 Surely none of the men that came up out of Egypt, from twenty years old and upward, shall see the land which I swore unto Abraham, unto Isaac, and unto Jacob; because they have not wholly followed me:
Numbers 33:1
1 These are the journeys of the children of Israel, who went forth out of the land of Egypt with their armies under the hand of Moses and Aaron.
Deuteronomy 3:18
18 And I commanded you at that time, saying, The LORD your God has given you this land to possess it: you shall pass over armed before your brethren the children of Israel, all that are fit for war.
Deuteronomy 24:5
5 When a man has taken a new wife, he shall not go out to war, neither shall he be charged with any business: but he shall be free at home one year, and shall bring happiness to his wife whom he has taken.
2 Samuel 24:9
9 And Joab gave the sum of the number of the people unto the king: and there were in Israel eight hundred thousand valiant men that drew the sword; and the men of Judah were five hundred thousand men.
2 Chronicles 17:13-18
13 And he had much business in the cities of Judah: and the men of war, mighty men of valor, were in Jerusalem.
14 And these are the numbers of them according to their father’s houses: Of Judah, the captains of thousands; Adnah the captain, and with him mighty men of valor three hundred thousand.
15 And next to him was Jehohanan the captain, and with him two hundred and fourscore thousand.
16 And next to him was Amasiah the son of Zichri, who willingly offered himself unto the LORD; and with him two hundred thousand mighty men of valor.
17 And of Benjamin; Eliada a mighty man of valor, and with him armed men with bow and shield two hundred thousand.
18 And next to him was Jehozabad, and with him a hundred and fourscore thousand prepared for war.
2 Chronicles 26:11-13
11 Moreover Uzziah had an army of fighting men, that went out to war by divisions, according to the number on their roll by the hand of Jeiel the scribe and Maaseiah the officer, under the hand of Hananiah, one of the king’s captains.
12 The whole number of the heads of the fathers’ houses of the mighty men of valor were two thousand and six hundred.
13 And under their hand was an army, three hundred thousand and seven thousand and five hundred, that made war with mighty power, to help the king against the enemy.