Isaiah 28:27-29

Threshing is not bruising. Three methods of threshing are alluded to. (a) Beating with a rod or flail (cf. Judges 6:11; Ruth 2:17). (b) Treading with the feet of cattle (Deuteronomy 25:4; Micah 4:13; but see on Isaiah 28:28). (c) Drawing a heavy wooden sledge, with sharp stones or iron spikes fixed in its under surface (ḥârûç) or a wagon (-ǎgâlâh) with a great number of sharp-edged wheels, over the grain. The point of the illustration is that the method suitable to one kind of grain would be ruinous to another (Isaiah 28:27); and that even the rougher methods are applied with moderation (Isaiah 28:28).