Musnad Ahmad 655:0

Al-Harith ibn Dirar al-Khuza'i said: I came to the Messenger of Allah (ﷺ), and he invited me to Islam, so I entered it and confessed to it. He commanded me to perform prayer, and I performed it. He commanded me to pay Zakat, and I paid it. Then he said: "Is there anything else?" I said: "O Messenger of Allah, by the One who sent you with the truth, no one has asked me for anything before you, and I have not refused anyone after you." He said: "Do not let the Zakat collector come to you and wrong you." I said: "By the One who sent you with the truth, I will not give anyone except the one who is righteous." He said: "O Harith, listen. There will be rulers after me who will cause death to the Sunnah and innovate innovations. Whoever supports them in their oppression and helps them in their injustice, he is not of me, and I am not of him, and he will not reach my Basin (al-Hawd)."