John Gill Commentary Jeremiah 49:9

"If grape-gatherers came to thee, would they not leave some gleaning grapes? if thieves by night, would they not destroy till they had enough?" — Jeremiah 49:9 (ASV)

If grape gatherers come to you, would they not leave [some] gleaning grapes ? &c.]

If gatherers of grapes, at the time of the vintage, should come into your fields to gather the grapes, being ripe, would not they leave some for the poor to glean? certainly they would, and not take every cluster. The Targum renders it, "if your spoilers, as grape gatherers, should come to you," &c.

if thieves by night, they will destroy till they have enough ;

who break into houses by night, these will eat and drink as much as is sufficient, and carry off what serves their turn; but they seldom take away everything they find in a house; they leave some things behind them; but it is suggested that the Chaldeans should take away all from the Edomites, and leave them nothing; see (Obadiah 1:5Obadiah 1:6) .