Musnad Abu Ya'la al-Mawsili 116:19

Ahmad narrated to us, Rawh ibn 'Ubadah narrated to us, Shu'bah narrated to us, from Qatadah, from Anas, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Indeed, for every prophet there is a supplication with which he supplicated for his nation. And I have reserved my supplication as an intercession for my nation on the Day of Resurrection."