Musnad Abu Ya'la al-Mawsili 109:238

Abu Khaythama narrated to us, Rawh narrated to us, Ibn Jurayj narrated to us, he said: Abu al-Zubayr informed me that he heard Jabir, from the Prophet (may Allah bless him and grant him peace): "For every prophet, there is a supplication with which he has supplicated for his nation. And I have hidden my supplication as an intercession for my nation on the Day of Resurrection."