Something a little more specific than three entire books would be useful here. If you're looking to make a point, chapter and verse is useful as a baseline rather than a general pointer towards three books.
All three of these books condemn the charging of interest.
“If you lend money to My people, to the poor among you, you are not to act as a creditor to him; you shall not charge him interest."
-Exodus 22:25 (NASB)
“You shall not charge interest to your countrymen: interest on money, food, or anything that may be loaned at interest. You may charge interest to a foreigner, but to your countrymen you shall not charge interest, so that the Lord your God may bless you in all that you undertake in the land which you are about to enter to possess.
-Deuteronomy 23:19-20 (NASB)
KING JAMES VERSION:
"Thou shalt not lend upon usury to thy brother; usury of money, usury of victuals, usury of any thing that is lent upon usury:
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."
-Deuteronomy 23:19-20 (KJV)
"Do not take usurious interest from him, but revere your God, that your countryman may live with you."
-Leviticus 25:36 (NASB)
“Then he may have a violent son who sheds blood and who does any of these things to a brother (though he himself did not do any of these things), that is, he even eats at the mountain shrines, and defiles his neighbor’s wife, oppresses the poor and needy, commits robbery, does not restore a pledge, but lifts up his eyes to the idols and commits abomination, he lends money on interest and takes increase; will he live? He will not live! He has committed all these abominations, he will surely be put to death; his blood will be on his own head.
-Ezekiel 18:10-13 (NASB)