And he brought out the people that were in it, and cut them with saws, and with harrows of iron, and with axes. Even so dealt David with all the cities of the children of Ammon. And David and all the people returned to Jerusalem. (1 Chronicles 20:3)
This expression varies by only one letter in the consonantal Hebrew from the reading in Samuel, which says “put them under saws”; that is, David put the Ammonites under forced labor with these implements (see on 2 Sam. 12:31).