Numbers 1:3

All those of twenty years old and over, who are able to go to war in Israel, are to be numbered by you and Aaron.

Exodus 30:14

Everyone who is numbered, from twenty years old and over, is to give an offering to the Lord.

Numbers 14:29

Your dead bodies will be stretched out in this waste land; and of all your number, all those of twenty years old and over who have been crying out against me,

Exodus 12:17

So keep the feast of unleavened bread; for on this very day I have taken your armies out of the land of Egypt: this day, then, is to be kept through all your generations by an order for ever.

Numbers 26:2

Let all the children of Israel be numbered, by the names of their fathers' families, all those of twenty years old and over who are able to go to war in Israel.

Numbers 32:11

Truly, not one of the men of twenty years old and over who came out of Egypt will see the land which I gave by oath to Abraham, Isaac, and Jacob; because they have not been true to me with all their heart;

Numbers 33:1

These are the journeys of the children of Israel, when they went out of the land of Egypt in their armies, under the direction of Moses and Aaron.

Deuteronomy 3:18

At that time I gave you orders, saying, The Lord has given you this land for your heritage: all the men of war are to go over armed before your brothers the children of Israel.

Deuteronomy 24:5

A newly married man will not have to go out with the army or undertake any business, but may be free for one year, living in his house for the comfort of his wife.

2 Samuel 24:9

And Joab gave the king the number of all the people: there were in Israel eight hundred thousand fighting men able to take up arms; and the men of Judah were five hundred thousand.

2 Chronicles 17:13-18

He had much property in the towns of Judah; he had forces of armed men, great and strong, in Jerusalem.

2 Chronicles 26:11-13

In addition, Uzziah had an army of fighting-men who went out to war in bands, as they had been listed by Jeiel the scribe and Maaseiah the ruler, under the authority of Hananiah, one of the king's captains.

Treasury of Scripture Knowledge

Summary

From twenty years old and upward, all that are able to go forth to war in Israel: thou and Aaron shall number them by their armies.

General references

Bible References

Able

Numbers 26:2
Let all the children of Israel be numbered, by the names of their fathers' families, all those of twenty years old and over who are able to go to war in Israel.
Deuteronomy 3:18
At that time I gave you orders, saying, The Lord has given you this land for your heritage: all the men of war are to go over armed before your brothers the children of Israel.
Deuteronomy 24:5
A newly married man will not have to go out with the army or undertake any business, but may be free for one year, living in his house for the comfort of his wife.
2 Samuel 24:9
And Joab gave the king the number of all the people: there were in Israel eight hundred thousand fighting men able to take up arms; and the men of Judah were five hundred thousand.
2 Chronicles 17:13
He had much property in the towns of Judah; he had forces of armed men, great and strong, in Jerusalem.
2 Chronicles 26:11
In addition, Uzziah had an army of fighting-men who went out to war in bands, as they had been listed by Jeiel the scribe and Maaseiah the ruler, under the authority of Hananiah, one of the king's captains.

By their

Numbers 33:1
These are the journeys of the children of Israel, when they went out of the land of Egypt in their armies, under the direction of Moses and Aaron.
Exodus 12:17
So keep the feast of unleavened bread; for on this very day I have taken your armies out of the land of Egypt: this day, then, is to be kept through all your generations by an order for ever.

General references

Numbers 1:47
But the Levites, of the tribe of their fathers, were not numbered among them.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain