Sayyiduna Abdullah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) "cursed the one who gives usury and the one who consumes it." The narrator said: I said: And its two witnesses and its writers too? He said: We narrate only what we heard.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10516