פירוש על דברי הימים א 21:23

and the threshing tools for [fire] wood [These are] boards with which they thresh the grain, as we learned in Avodah Zarah (24b): “A goat with hooks,” [which is the] name of a threshing-sledge, similar to (Isa. 41:15): “a new grooved threshing sledge (מוֹרַג חָרוּץ).”