'Winnowing' in the Bible

Now Boaz, with whose female servants you worked, is our close relative. Look, tonight he is winnowing barley at the threshing floor.

"At that time the people of Judah and Jerusalem will be told, 'A scorching wind will sweep down from the hilltops in the desert on my dear people. It will not be a gentle breeze for winnowing the grain and blowing away the chaff.