To a stranger you may lend on usury; but to your brother you shall not lend on usury: that the LORD your God may bless you in all that you set your hand to in the land where you go to possess it.
And this is the manner of the release: Every creditor that lends ought to his neighbor shall release it; he shall not exact it of his neighbor, or of his brother; because it is called the LORD's release.
When you shall vow a vow to the LORD your God, you shall not slack to pay it: for the LORD your God will surely require it of you; and it would be sin in you.