It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Every prophet certainly had a supplication that was accepted, and every prophet had his supplication accepted in this world, but I have reserved my supplication for the intercession of my Ummah. And, insha’Allah, this intercession will be granted to every person who dies in such a state that he does not associate anyone with Allah.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 9504