Abu Burdah (may Allah have mercy on him) says: I met Sayyiduna Abdullah bin Salam (may Allah be pleased with him) in Madinah, and he said: Come home with me so that I may give you a drink from a cup from which the Messenger of Allah (peace and blessings be upon him) drank, and you may pray in a place where he (peace and blessings be upon him) prayed. I went with him, and he gave me sawiq (barley gruel) to drink and fed me dates, and I prayed in that mosque. Then Sayyiduna Abdullah (may Allah be pleased with him) said: You are in a land where usury (riba) is widespread, and a door of usury is that when someone gives a loan for a fixed term, and the term ends, the borrower comes to repay the loan with his basket filled with a gift. So beware of that basket and what is in it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10926