2 Samuel 24:9-10

ISV^{(i) 9} Joab reported the total number of men to the king. In Israel there were 800,000 men trained for war. In Judah there were 500,000.
¹⁰ Discipline for David’s Sin
Later, David’s conscience bothered him after he had numbered the army, so David told the LORD, “I have sinned greatly by what I did. But now I am asking you, please remove the guilt of your servant, since I have acted very foolishly.”