John Wesley on Leviticus 25:36

Of him - That is, of thy brother, whether he be Israelite, or proselyte. Or increase - All kinds of usury are in this case forbidden, whether of money, or of victuals, or of any thing that is commonly lent by one man to another upon usury, or upon condition of receiving the thing lent with advantage and overplus. If one borrow in his necessity, there can be no doubt but this law is binding still. But it cannot be thought to bind, where money is borrowed for purchase of lands, trade, or other improvements. For there it is reasonable, that the lender share with the borrower in the profit.