Sahih Muslim | Book 1 | Hadith Number 396

Narrated by Abu Zubair
Abu Zubair heard Jabir b. Abdullah reporting it from the Apostle of Allah (may peace be upon him): For every apostle was a prayer with which he prayed (to his Lord) for his Ummah, but I have reserved my prayer for the intercession of my Ummah on the Day ofResurrection.