It is narrated from Sayyiduna Jabir (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: Every prophet had a supplication which he made for his ummah, and I have reserved my supplication for my ummah as intercession for the Day of Resurrection.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 15116