Musnad Ahmad 30:1809

Qutaybah narrated to us, Layth narrated to us, from Ibn ‘Ajlan, from al-Qa‘qa‘ ibn Hakim, from Abu Salih, from Abu Hurayrah, that the Prophet, may Allah bless him and grant him peace, said: "A group will continue to be upon this matter, upon the truth. Those who oppose them will not harm them, until the command of Allah, the Almighty and Majestic, comes to them while they are in that state."