For most of its history, the threshing floor was an outside space. The grain was spread out over a stone or hard-packed dirt. Then an animal (an ox, donkey, or horse) would walk across the grain to break the kernels. So the outside shell of the grain would then need to be separated from the good part of the grain.
Indeed, your threshing will last for you until grape gathering, and grape gathering will last until sowing time. You will thus eat your food to the full and live securely in your land.
JUDGES 6:11 Then the angel of the Lord came and sat under the oak that was in Ophrah, which belonged to Joash the Abiezrite as his son Gideon was beating out wheat in the wine press in order to save it from the Midianites
1ST CHRON. 21:20 Now Ornan turned back and saw the angel, and his four sons who were with him hid themselves. And Ornan was threshing wheat.
1ST COR. 9:9 For it is written in the Law of Moses, “You shall not muzzle the ox while he is threshing.” God is not concerned about oxen, is He?
MATTHEW: 30:24-30
Another parable He put forth to them, saying: “The kingdom of heaven is like a man who sowed good seed in his field; 25 but while men slept, his enemy came and sowed tares among the wheat and went his way. 26 But when the grain had sprouted and produced a crop, then the tares also appeared. 27 So the servants of the owner came and said to him, ‘Sir, did you not sow good seed in your field? How then does it have tares?’ 28 He said to them, ‘An enemy has done this.’ The servants said to him, ‘Do you want us then to go and gather them up?’ 29 But he said, ‘No, lest while you gather up the tares you also uproot the wheat with them. 30 Let both grow together until the harvest, and at the time of harvest I will say to the reapers, “First gather together the tares and bind them in bundles to burn them, but gather the wheat into THE BARNS.