Isaiah 17:6

Yet gleaning grapes shall be left in it; in the land of Israel, as the shaking of an olive-tree, two or three berries in the top of the uppermost bough, four or five in the outmost fruitful branches thereof, saith the Lord God of Israel. In harvesting olives, the trees were first shaken, whereupon a few berries within reach were knocked down with sticks, but those which hung in the tree-tops, beyond reach, remained hanging. Thus only a few poor inhabitants would be left in Israel.