Ayyub (may Allah have mercy on him) said: I heard Abu Qilabah (may Allah have mercy on him) say: In the time of Ibn Ziyad, people used to take dinars for dirhams on credit. So a man from the Companions of the Prophet (peace and blessings be upon him), who was called Hisham bin Amir (may Allah be pleased with him), stood up and said: "The Messenger of Allah (peace and blessings be upon him) forbade selling gold for silver on credit, and he informed us that this is a form of usury (riba)."
Hadith Referenceالمعجم الكبير للطبراني / باب الهاء / 18678