Usury or Interest

The lending of money or other property for increase.
Leviticus 25:37 Thou shalt not give him thy money upon usury, nor lend him thy victuals for increase.
Those enriched by unlawful, not allowed to enjoy their gain.
Psalm 28:8 The LORD is their strength, and he is the saving strength of his anointed.
The curse attending the giving or receiving of unlawful, alluded to.
Jeremiah 15:10 Woe is me, my mother, that thou hast borne me a man of strife and a man of contention to the whole earth! I have neither lent on usury, nor men have lent to me on usury; yet every one of them doth curse me.

Forbidden to take, from brethren.
Deuteronomy 23:19 Thou shalt not lend upon usury to thy brother; usury of money, usury of victuals, usury of any thing that is lent upon usury:
Forbidden to take, from brethren specially when poor.
Exodus 22:25 If thou lend money to any of my people that is poor by thee, thou shalt not be to him as an usurer, neither shalt thou lay upon him usury.

Leviticus 25:35-37 And if thy brother be waxen poor, and fallen in decay with thee; then thou shalt relieve him: yea, though he be a stranger, or a sojourner; that he may live with thee. 36 Take thou no usury of him, or increase: but fear thy God; that thy brother may live with thee. 37 Thou shalt not give him thy money upon usury, nor lend him thy victuals for increase.

Often guilty of taking.
Nehemiah 5:6-7 And I was very angry when I heard their cry and these words. 7 Then I consulted with myself, and I rebuked the nobles, and the rulers, and said unto them, Ye exact usury, every one of his brother. And I set a great assembly against them.
Required to restore.
Nehemiah 5:9-13 Also I said, It is not good that ye do: ought ye not to walk in the fear of our God because of the reproach of the heathen our enemies? 10 I likewise, and my brethren, and my servants, might exact of them money and corn: I pray you, let us leave off this usury. 11 Restore, I pray you, to them, even this day, their lands, their vineyards, their oliveyards, and their houses, also the hundredth part of the money, and of the corn, the wine, and the oil, that ye exact of them. 12 Then said they, We will restore them, and will require nothing of them; so will we do as thou sayest. Then I called the priests, and took an oath of them, that they should do according to this promise. ...
Allowed to take, from strangers.
Deuteronomy 23:20 Unto a stranger thou mayest lend upon usury; but unto thy brother thou shalt not lend upon usury: that the LORD thy God may bless thee in all that thou settest thine hand to in the land whither thou goest to possess it.

True and faithful Israelites never took, from their brethren.
Psalm 15:5 He that putteth not out his money to usury, nor taketh reward against the innocent. He that doeth these things shall never be moved.

Ezekiel 18:8-9 He that hath not given forth upon usury, neither hath taken any increase, that hath withdrawn his hand from iniquity, hath executed true judgment between man and man, 9 Hath walked in my statutes, and hath kept my judgments, to deal truly; he is just, he shall surely live, saith the Lord GOD.
Judgments denounced against those who exacted unlawful.
Isaiah 24:1-2 Behold, the LORD maketh the earth empty, and maketh it waste, and turneth it upside down, and scattereth abroad the inhabitants thereof. 2 And it shall be, as with the people, so with the priest; as with the servant, so with his master; as with the maid, so with her mistress; as with the buyer, so with the seller; as with the lender, so with the borrower; as with the taker of usury, so with the giver of usury to him.
Illustrative of the improvement of talents received from God.
Matthew 25:27 Thou oughtest therefore to have put my money to the exchangers, and then at my coming I should have received mine own with usury.

Luke 19:23 Wherefore then gavest not thou my money into the bank, that at my coming I might have required mine own with usury?

[NTT 282-284]