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Narrated by Abu Al-Minhal I used to practice money exchange, and I asked Zaid bin 'Arqam about it, and he narrated what the Prophet said in the following: Abu Al-Minhal said, "I asked Al-Bara' bin 'Azib and Zaid bin Arqam about practicing money exchange. They replied, 'We were traders in the time of Allah's Apostle and I asked Allah's Apostle about money exchange. He replied, 'If it is from hand to hand, there is no harm in it; otherwise it is not permissible."