Mukhtasar Bukhari

It was asked from Sayyiduna Bara bin Azib and Zaid bin Arqam (may Allah be pleased with them) about (currency exchange business). Each of them said (about the other), "He is better than me (ask him)." After that, both of them said that the Messenger of Allah (peace and blessings of Allah be upon him) forbade selling gold for silver on credit.