2 Samuel 24:7-11

then they came to the fortress of Tyre and to all the cities of the Hivites and of the Canaanites, and they went out to the south of Judah, to Beersheba.

So when they had roamed about through the whole land, they came to Jerusalem at the end of nine months and twenty days.

And Joab gave the number of the census of the people to the king: in Israel there were eight hundred thousand valiant men who drew the sword, and the men of Judah were five hundred thousand men.

Now David’s heart troubled him after he had counted the people. So David said to the Lord, “I have sinned greatly in what I have done. But now, Lord, please overlook the guilt of Your servant, for I have acted very foolishly.”

When David got up in the morning, the word of the Lord came to Gad the prophet, David’s seer, saying,