It is narrated from Sayyiduna al-Bara' bin Azib and Sayyiduna Zayd bin Arqam (may Allah be pleased with them both) that they both said: "The Messenger of Allah (peace and blessings be upon him) forbade selling silver for gold on credit."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from al-Hakam (may Allah have mercy on him) except Sulayman (may Allah have mercy on him)."