Musnad Ahmad 459:12

'Abd al-Rahman ibn Mahdi narrated to us, from Mu'awiyah—meaning Ibn Salih—from Yunus ibn Sayf, from al-Harith ibn Ziyad, from Abu Ruhm, from al-'Irbad ibn Sariyah al-Sulami, who said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, while he was calling to the suhoor in the month of Ramadan: "Come to the blessed meal." Then I heard him say: "O Allah, teach Mu'awiyah the Book and the reckoning, and protect him from the punishment."