It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Through the intercession of one man from my Ummah, more people than the number of the tribe of Mudar will enter Paradise. A man will intercede for his household, and his intercession will be according to his deeds."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 8028