Harb bin Ubaydullah narrates from his maternal grandfather, and he from his father, that the Messenger of Allah (peace and blessings be upon him) said: "The tithes are upon the Jews and Christians, and there are no tithes upon the Muslims." (b) The Messenger of Allah (peace and blessings be upon him) said: "The tithe, that is, the one-tenth, is not due from the Muslims; rather, it is upon the Jews and Christians."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجزية / 18703