That we may buy the poor for silver, and the needy for a pair of shoes; yea, and sell the refuse of the wheat? That we may buy the poor for silver - Buying their services for such a time, with just money enough to clear them from other creditors.
And the needy for a pair of shoes - See Amos 2:6.
And sell the refuse of the wheat! - Selling bad wheat and damaged flour to poor people as good, knowing that such cannot afford to prosecute them.