Musnad Ahmad 30:3708

Muhammad ibn Ubayd narrated to us, Dawud al-Awdi narrated to us, from his father, from Abu Hurayrah, from the Prophet, peace and blessings of Allah be upon him, who said regarding the verse: "It may be that your Lord will raise you to a praised station" [Al-Isra: 79]: "It is the station in which I will intercede for my nation."