Exodus 22:25-27

(25-27) The Mosaic law of borrowing and lending was strange and peculiar. It was absolutely forbidden to exact any interest from those borrowers who were Israelites. The wording of the present passage, and of some others (Leviticus 25:35; Deuteronomy 15:7), construed strictly, prohibits interest only on loans to the poor; but, as in a primitive state of society only the poor wish to borrow, the qualifying expression lost its force, and to exact any interest of any Israelite was regarded as wrong. (See Psalms 15:5; Proverbs 28:8; Nehemiah 5:7; Nehemiah 5:11; Ezekiel 18:13; Ezekiel 22:12.) And some prohibitions, as Deuteronomy 23:19, were expressed in the most general terms. On the other hand, the lending of money upon interest to foreigners was distinctly allowed (Deuteronomy 23:20), and no limit placed upon the amount of interest that might be taken.