Most Muslim jurists and scholars regard the jizya as a special payment collected from certain non-Muslims in return for the responsibility of protection fulfilled by Muslims against any type of aggression, as well as for non-Muslims being exempt from military service, and in exchange for the aid provided to poor dhimmis. In a treaty made by Khalid with some towns in the neighborhood of Hirah, he writes: "If we protect you, then jizya is due to us; but if we do not, then it is not due." Early Hanafi jurist Abu Yusuf writes: