Jamieson, Fausset & Brown

even out of the thorns--Even when part of the grain remains hanging on the thorn bushes (or, "is growing among thorns," Mat 13:7), the hungry gleaner does not grudge the trouble of even taking it away, so clean swept away is the harvest of the wicked. the robber--as the Sabeans, who robbed Job. Rather, translate "the thirsty," as the antithesis in the parallelism, "the hungry," proves.