4. Oppression and extortion. To enrich themselves they wronged the poor (v. 7): They dealt by oppression and deceit with the stranger, taking advantage of his necessities, and his ignorance of the laws and customs of the country. In Jerusalem, that should have been a sanctuary to the oppressed, they vexed the fatherless and widows by unreasonable demands and inquisitions, or troublesome law-suits, in which might prevails against right. "Thou hast taken usury and increase (v. 12); not only there are those in thee that do it, but thou hast done it." It was an act of the city or community; the public money, which should have been employed in public charity, was put out to usury, with extortion. Thou hast greedily gained of thy neighbours by violence and wrong. For neighbours to gain by one another in a way of fair trading is well, but those who are greedy of gain will not be held within the rules of equity.