2 Chronicles 25:5

Moreover, Amaziah assembled Judah and appointed them according to their fathers’ households under commanders of thousands and commanders of hundreds throughout Judah and Benjamin; and he took a census of those from twenty years old and upward and found them to be 300,000 choice men, able to go to war and handle spear and shield.

Numbers 1:3

from twenty years old and upward, whoever is able to go out to war in Israel, you and Aaron shall number them by their armies.

2 Chronicles 17:14-18

This was their muster according to their fathers’ households: of Judah, commanders of thousands, Adnah was the commander, and with him 300,000 valiant warriors;

2 Chronicles 11:1

Now when Rehoboam had come to Jerusalem, he assembled the house of Judah and Benjamin, 180,000 chosen men who were warriors, to fight against Israel to restore the kingdom to Rehoboam.

Exodus 18:25

Moses chose able men out of all Israel and made them heads over the people, leaders of thousands, of hundreds, of fifties and of tens.

1 Samuel 8:12

He will appoint for himself commanders of thousands and of fifties, and some to do his plowing and to reap his harvest and to make his weapons of war and equipment for his chariots.

1 Chronicles 13:1

Then David consulted with the captains of the thousands and the hundreds, even with every leader.

1 Chronicles 27:1

Now this is the enumeration of the sons of Israel, the heads of fathers’ households, the commanders of thousands and of hundreds, and their officers who served the king in all the affairs of the divisions which came in and went out month by month throughout all the months of the year, each division numbering 24,000:

2 Chronicles 14:8

Now Asa had an army of 300,000 from Judah, bearing large shields and spears, and 280,000 from Benjamin, bearing shields and wielding bows; all of them were valiant warriors.

2 Chronicles 26:13

Under their direction was an elite army of 307,500, who could wage war with great power, to help the king against the enemy.

Treasury of Scripture Knowledge

Summary

Moreover Amaziah gathered Judah together, and made them captains over thousands, and captains over hundreds, according to the houses of their fathers, throughout all Judah and Benjamin: and he numbered them from twenty years old and above, and found them three hundred thousand choice men, able to go forth to war, that could handle spear and shield.

From twenty

Bible References

Captains over thousands

Exodus 18:25
Moses chose able men out of all Israel and made them heads over the people, leaders of thousands, of hundreds, of fifties and of tens.
1 Samuel 8:12
He will appoint for himself commanders of thousands and of fifties, and some to do his plowing and to reap his harvest and to make his weapons of war and equipment for his chariots.
1 Chronicles 13:1
Then David consulted with the captains of the thousands and the hundreds, even with every leader.
1 Chronicles 27:1
Now this is the enumeration of the sons of Israel, the heads of fathers’ households, the commanders of thousands and of hundreds, and their officers who served the king in all the affairs of the divisions which came in and went out month by month throughout all the months of the year, each division numbering 24,000:

From twenty

Numbers 1:3
from twenty years old and upward, whoever is able to go out to war in Israel, you and Aaron shall number them by their armies.

Three

2 Chronicles 11:1
Now when Rehoboam had come to Jerusalem, he assembled the house of Judah and Benjamin, 180,000 chosen men who were warriors, to fight against Israel to restore the kingdom to Rehoboam.
2 Chronicles 14:8
Now Asa had an army of 300,000 from Judah, bearing large shields and spears, and 280,000 from Benjamin, bearing shields and wielding bows; all of them were valiant warriors.
2 Chronicles 17:14
This was their muster according to their fathers’ households: of Judah, commanders of thousands, Adnah was the commander, and with him 300,000 valiant warriors;