from Prophet SAW. Shariah had prohibited Riba. Now, a general consensus among Muslim economists that Riba is not restricted to usury but encompasses interest as well. Generally, the principle of Islamic banking is Zakah which is the 4th pillar of Islam. This principle is most of the important because all things belong to God, and the wealth will be hold by human as a trust. Zakat means both ‘growth’ and ‘purification’. All the possessions are purified with put aside that follow that proportion for those in need. Next, the prohibition of Riba’ is one of the principle of Islamic banking. There have two interpretations of riba’s means that based on Islamic scholars which are reasonable interest rate are allowed based on a modernist view and the second is any kind that any kind of fixed interest is wrong that based on a conservative view. The principle of Islamic banking is also the prohibition of unearned income (Al Maysir) and unproductive speculation as well as gambling (Al Quimar). Next, the freedom from excessive and lastly is prohibition of debt arrangements where participatory arrangements between capital and labor will get advise by Islamic economic institution. Sources of Fund for Islamic Microfinance Institutions According to Saad N. M. (2012), the sources of fund to Islamic Microfinance Institutions are waqf, infaq and shadaqah. It will give an advantage to the Islamic banks. The other sources of fund for Islamic Microfinance Institutions are General Saving Deposit, General and Special investment Deposit, Islamic Charitable Purpose Fund, and Qardhul Hassan Investment Deposit. The General Saving Deposit of IMFIs is same with the saving deposits products of Islamic banking practices. There are two categories that used in this product which are Wadiah and mudharabah. Customers who open Wadiah Saving Deposit expect a return because the return based on the discretion of the bank. Microfinance activity probably needs the collection of saving from their client. If the clients do not want their savings distributed back by other clients, the bank will offer them Wadiah Saving Deposit product. The second source is Mudharabah Saving Deposit IMFIs will use the money that give by depositors for investments. IMFIs play as a role as Mudarib and the depositors will play as a Rabbul Mal for this product. This fund would help the customer because IMFIs will distribute the fund from Mudharabah Saving Deposit Account to IMFIs clients for investing as well as to generate more business and reduce the poverty among of IMFIs clients.