Musnad Ahmad 32:1992

Abu Dawud narrated to us, Shu'bah informed us, from Thabit, who said: I heard Anas saying: The Prophet, peace and blessings of Allah be upon him, used to frequently supplicate: "O Allah, give us in this world [that which is] good, and in the Hereafter [that which is] good, and protect us from the punishment of the Fire." Shu'bah said: So I mentioned that to Qatadah, and he said: Anas used to say this.