2 Samuel 12:31

And he brought forth the people that were there in, in the acropolis, and put them under saws, putting them to death by sawing them apart, and under harrows, instruments or axes, of iron, and under axes of iron, knives or other cutting instruments, and made them pass through the brick-kiln, the place where they burned their children to their idol Moloch; and thus did he unto all the cities of the children of Ammon. The purpose was to inflict a striking punishment upon idolatry, for the war was a holy war. So David and all the people returned unto Jerusalem. This great victory was another proof of God's grace and favor, for He is kind and gracious, and abundant in mercy and truth, forgiving iniquities, and transgressions, and sins.