Musnad Ahmad 30:2563

Muhammad ibn Ubayd narrated to us, he said: Al-A’mash narrated to us, from Abu Salih, from Abu Hurayrah—Al-A’mash said: I do not see it except that he raised it [to the Prophet]—he said: "Woe to the Arabs from a matter that has drawn near. Successful is he who restrains his hand." And Abu Mu’awiyah attributed it as a statement of Abu Hurayrah (stopped at him).