Musnad Ahmad 482:4

Muhammad ibn Salamah narrated to us, from Ibn Ishaq, from Yazid ibn Abi Habib, from Abd al-Rahman ibn Shumasah al-Tujibi, from Uqbah ibn Amir, who said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, say: "The collector of illegal taxes (sahib maks) shall not enter Paradise."