'Grape gatherers' in the Bible

This is what the LORD of the Heavenly Armies says: "Let them glean the remnant of Israel as thoroughly as they would the vine. Pass your hand over them like grape gatherers over the branches.

If grapegatherers come to thee, would they not leave some gleaning grapes? if thieves by night, they will destroy till they have enough.

If thieves came to thee, if robbers by night, (how art thou cut off!) would they not have stolen till they had enough? if the grapegatherers came to thee, would they not leave some grapes?

Woe is me! For I amLike the fruit pickers, like the grape gatherers.There is not a cluster of grapes to eat,Or a first-ripe fig which I crave.