Harb bin Ubaydullah bin Umayr al-Thaqafi narrates from his grandfather (may Allah be pleased with him), who was from Banu Taghlib: I came to the Prophet (peace and blessings be upon him) and accepted Islam. He (peace and blessings be upon him) taught me Islam and showed me the way to collect charity from the Muslims. Then I returned to him (peace and blessings be upon him) and said: O Messenger of Allah (peace and blessings be upon him)! I remember what you taught me, except the charity: should I collect a tenth from them? He (peace and blessings be upon him) said: "No, the tenth is only upon the Jews and Christians."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجزية / 18704