Numbers 1:3
from twenty years and above: even all that are able to go forth into war in Israel, thou and Aaron shall number them in their armies.
Exodus 30:14
And all that are numbered of them that are twenty years old and above shall give a heave offering unto the LORD.
Numbers 14:29
Your carcasses shall lie in this wilderness, neither shall any of these numbers which were numbered from twenty years and above of you which have murmured against me
Exodus 12:17
And see that ye keep you to unleavened bread. For upon that same day I will bring your armies out of the land of Egypt, therefore ye shall observe this day and all your children after you, that it be a custom forever.
Numbers 26:2
"Take the number of all the multitude of the children of Israel from twenty years and above throughout their fathers' houses, all that are able to go to war in Israel."
Numbers 32:11
'None of the men that came out of Egypt, from twenty years old and above, shall see the land which I swore unto Abraham, Isaac and Jacob, because they have not continually followed me:
Numbers 33:1
These are the journeys of the children of Israel which went out of the land of Egypt with their armies under Moses and Aaron.
Deuteronomy 3:18
And I commanded you the same time, ye Reuben and Gad, saying, 'The LORD your God hath given you this land to enjoy it: see that ye go harnessed before your brethren the children of Israel, all that are men of war among you.
Deuteronomy 24:5
When a man taketh a new wife, he shall not go a warfare neither shall be charged with any business: but shall be free at home one year and rejoice with his wife which he hath taken.
2 Samuel 24:9
And then Joab delivered up the reckoning of the number of the people unto the king. And there were found in Israel nine hundred thousand men of might that drew swords. And the men of Judah were five hundred thousand men.
2 Chronicles 17:13-18
And he had great substance in the cities of Judah, and fighting men and men of might in Jerusalem.
2 Chronicles 26:11-13
And Uzziah had a host of fighting men that went out to war in the army and were told and numbered by Jeiel the scribe and Maaseiah an officer, under the hand of Hananiah, one of the king's lords.