'Threshing' in the Bible

You are my threshing, and the grain of my floor!" That which I have heard from Yahweh of Armies, the God of Israel, I have declared to you.

Bread flour must be ground; so he will not always be threshing it. Although he drives the wheel of his threshing cart over it, his horses don't grind it.

Behold, I have made you into a new sharp threshing instrument with teeth. You will thresh the mountains, and beat them small, and will make the hills like chaff.