Ata' narrates from a man of Bakr bin Wa'il, who narrates from his maternal uncle (may Allah be pleased with him): I said: O Messenger of Allah! Should I collect a tenth from my people? He (peace and blessings be upon him) said: "The tenth is collected only from the Jews and Christians."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجزية / 18706