Sayyiduna Rifa'ah bin Rafi' (may Allah be pleased with him) went out with the Messenger of Allah (peace and blessings be upon him) to the prayer ground (musalla) of Madinah and found the people buying and selling, and he (peace and blessings be upon him) said: "O assembly of merchants!" They responded and raised their necks and their eyes towards him (peace and blessings be upon him), and he (peace and blessings be upon him) said: "Indeed, merchants will be raised on the Day of Resurrection as wrongdoers, except the one who fears Allah, speaks the truth and acts righteously."
Hadith Referenceالمعجم الكبير للطبراني / باب الراء / 4527