II Samuel 24:10

10 David was conscience-stricken after he had counted the fighting men, and he said to the Lord, "I have sinned greatly in what I have done. Now, Lord, I beg you, take away the guilt of your servant. I have done a very foolish thing."

10 And after the people had been numbered, David's heart was troubled. And David said to the Lord, Great has been my sin in doing this; but now, O Lord, be pleased to take away the sin of your servant, for I have done very foolishly