'Threshing sledges' in the Bible

And he brought out the people that were in it, and he will contend with the saw and with threshing-sledges of iron, and with saws. And David will do thus to all the cities of the sons of Ammon. And David will turn back and all the people, to Jerusalem.

And Ornan will say to David, Take to thee, and my lord the king shall, do the good in his eyes: see, I gave the oxen for burnt-offerings, and the threshing-sledges for woods, and the wheat for a gift; I gave all.