'Gleaning' in the Bible

It will be even like the reaper gathering the standing grain,As his arm harvests the ears,Or it will be like one gleaning ears of grainIn the valley of Rephaim.

Yet gleaning grapes shall be left in it, 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.

When thus it shall be in the midst of the land among the people, there shall be as the shaking of an olive tree, and as the gleaning grapes when the vintage is done.