By usury and unjust gain, Heb. by usury and (or, or) increase, i.e. by any kind of usury, whereby the poor are oppressed, as is implied from the opposite clause; or by any unrighteous practices. See more of these words and of this thing on Exo_22:25Lev_25:35,36 Psa 15:5 Eze_18:8.
Shall gather it for him that will pity the poor; it shall not long continue with him or his, but shall by God’s righteous and powerful providence be disposed into more just and merciful hands.