The Armies of Israel: Before Going to War were Numbered and Reviewed

Then David reviewed his troops and appointed over them commanders of thousands and of hundreds.

He sent out the troops, a third under Joab, a third under Joab’s brother Abishai son of Zeruiah, and a third under Ittai the Gittite. And the king said to the troops, “I will surely march out with you as well.”

“I will do whatever seems best to you,” the king replied. So he stood beside the gate, while all the troops marched out by hundreds and by thousands.

…not including the revenue from the merchants, traders, and all the Arabian kings and governors of the land.

The king made silver as common in Jerusalem as stones, and cedar as abundant as sycamore in the foothills.