Abu al-Sha'tha' Jabir bin Zayd (may Allah have mercy on him) narrates that he heard Sayyiduna Ibn Abbas (may Allah be pleased with them both) say: "I seek forgiveness from Allah and repent to Him from my (former) view regarding sarf (the exchange of currency); I met someone who has more knowledge than I do of the sayings of the Messenger of Allah (peace and blessings be upon him), and he told me that it is forbidden."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Abu Ghifar except Isa."
Hadith Referenceالمعجم الأوسط / باب الألف / 1620
Hadith Takhrij«أخرجه الحاكم فى «المستدرك» برقم: 6362، وابن حجر فى «المطالب العالية» برقم: 1372، والطبراني فى «الكبير» برقم: 457، 456»