The meaning of Usury in the Bible
(From Easton's Bible Dictionary)

the sum paid for the use of money, hence interest; not, as in the modern sense, exorbitant interest. The Jews were forbidden to exact usury (Leviticus 25:36,37), only, however, in their dealings with each other (Deuteronomy 23:19,20). The violation of this law was viewed as a great crime (Psalms 15:5; Proverbs 28:8; Jeremiah 15:10). After the Return, and later, this law was much neglected (Nehemiah 5:7,10).

See more on the meaning of Usury in the Bible:
Usury {International Standard Bible Encyclopedia}

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