Musnad Abu Ya'la al-Mawsili 245:30

Abu al-Walid al-Qurashi narrated to us, al-Walid narrated to us, from Ibn Jabir, from Umayr ibn Hani, from Mu'awiyah ibn Abi Sufyan, that he delivered a sermon to them and said: I heard the Messenger of Allah (peace and blessings of Allah be upon him) saying: "There will not cease to be a community from my Ummah standing by the command of Allah, the Mighty and Majestic. Those who abandon them and those who oppose them will not harm them, until the command of Allah comes while they are in that state." Umayr said: Malik ibn Yukhāmir al-Saksaki said: "O Commander of the Faithful, I heard Mu'adh ibn Jabal saying: 'And they are in Ash-Sham.'" Mu'awiyah said: "This is Malik ibn Yukhāmir, and he has the soul [i.e., he is a witness], claiming that he heard Mu'adh saying: 'They are the people of Ash-Sham.'"