Bismillah Walhamdulillah Was Salaatu Was Salaam 'ala Rasulillah

As-Salaam Alaikum Wa-Rahmatullahi Wa-Barakatuhu

The sin of the Riba giver.

Sales and Trade
Volume 3, Book 34, Number 299:

Narrated 'Aun bin Abu Juhaifa (May Allah be pleased with him):
My father bought a slave who practiced the profession of cupping. (My
father broke the slave's instruments of cupping). I asked my father why
he had done so. He replied, "The Prophet (PBUH) forbade the acceptance of
the price of a dog or blood, and also forbade the profession of
tattooing, getting tattooed and receiving or giving Riba, (usury), and
cursed the picture-makers."