'Threshing floors' in the Bible

They told David, "The Philistines are fighting in Keilah and are looting the threshing floors."

Then the iron, clay, bronze, silver, and gold were broken in pieces without distinction and became like chaff from the summer threshing floors that the wind carries away. Not a trace of them could be found. But the stone that struck the statue became a large mountain that filled the entire earth.

Threshing floors and wine vats will not feed the people, and new wine only deceives them.

The threshing floors are full of grain; the vats overflow with fresh wine and olive oil.