Mas’ala 12813الأمShafi'ivol. 4, p. 23vol. 4, p. 23 وَإِذَا اخْتَلَفَا فَلَا بَأْسَ بِالتَّفَاضُلِ يَدًا بِيَدٍ، Read the whole chapterCopy with source On the map: PartnershipCompare