Musnad Ahmad 30:2180

Muhammad ibn Ja'far narrated to us, he said: Shu'bah narrated to us, from Muhammad ibn Ziyad, he said: I heard Abu Hurairah narrating that the Prophet of Allah, peace and blessings of Allah be upon him, said: "For every prophet, there is a supplication with which he supplicated for his nation, and it was answered for him. And I want, if Allah wills, to delay my supplication as an intercession for my nation on the Day of Resurrection."