Banking. Today's interest-free banks continue their activities in line with principles of mudaraba.In accordaiice with these principles, the se banks co llect deposits in status of profit and losspartnership,depositors partners for their benefits and losses in appearance. In this strucrure, the ir obligation ofrepayinent for the ir depositors is removed exactly in their loss. Yet there is no similarity betweenmudaraba aiid banking, but a little. From this point of view, mudaraba doesn't own qualities thatwill be basis for banking system; thus, it makes iiiterest-free banks face excessive problems. Wepropose that the salaph method used by Zubair b. Avvam as a collecting capital system in theperiod of Prophet Muhammad (pbuh) and flrst four caliphs should be accept as a foundation inthe iiiterest-free banking system