Musnad Abu Ya'la al-Mawsili 130:6

Abu Khaythama narrated to us, Ismail narrated to us, from Abd al-Aziz ibn Suhayb, who said: Qatada asked Anas, "Which supplication did the Prophet, may Allah bless him and grant him peace, supplicate with the most?" He said: "The supplication that the Prophet, may Allah bless him and grant him peace, used to supplicate with the most was: '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.'" He said: "And when Anas wanted to supplicate with a supplication, he would supplicate with it, and when he wanted to supplicate with a prayer, he would supplicate with it."