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It was a land tax collected from non-Muslims. It was also prevalent among the Iranians, known as kharaj. The Romans called it tributum soli. When Khaibar was conquered, the Muslims had neither enough slaves to cultivate the newly conquered lands nor they have time to do it themselves. The Jews offered to cultivate the lands as tenants of the state and pay it a part of the produce. The Prophet granted their request and fixed the kharaj at half of the produce. Thus, the institution of kharaj came into being among the Arabs.