Jamieson, Fausset & Brown

buy . . . poor for silver . . . pair of shoes--that is, that we may compel the needy for money, or any other thing of however little worth, to sell themselves to us as bondmen, in defiance of Lev 25:39; the very thing which brings down God's judgment (Amo 2:6). sell the refuse of . . . wheat--which contains no nutriment, but which the poor eat at a low price, being unable to pay for flour.