Alqamah (may Allah have mercy on him) narrates from Abdullah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Tax and a tenth are not both combined upon a Muslim."
This hadith is false (batil) as a connected and marfu' (raised to the Prophet) report, and Yahya bin 'Anbasah is accused of fabrication. Ibn Adi (may Allah have mercy on him) said: Abu Hanifah narrates it only from Hammad from Ibrahim as Ibrahim's own saying; Yahya bin 'Anbasah narrated it from Abu Hanifah and connected it to the Prophet (peace and blessings be upon him). Yahya bin 'Anbasah's weakness is evident, because he narrates fabricated reports from trustworthy narrators.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7499