It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both), he says: I used to trade camels in Baqi‘ and would deal in dinars, but would take dirhams instead, and similarly, I would deal in dirhams and would take dinars instead. So I came to the Noble Prophet (peace and blessings be upon him) while he was either entering his chamber or coming out of the house of Sayyidah Hafsa (may Allah be pleased with her). I held onto his garment and asked him about this trade. The Prophet (peace and blessings be upon him) said: (It is permissible, but) when you exchange one thing for another in dirhams and dinars, then let not the other man separate from you while there remains anything of that transaction between you. In another narration, the Prophet (peace and blessings be upon him) said: If you take it at the rate of that same day, then there is no harm in doing so, but the condition is that you do not separate while there remains anything of that transaction between you.