It is narrated from Sayyiduna Wathilah bin al-Asqa' (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Through the intercession of one man of my Ummah, more people than (the entire tribe of) Banu Tamim will enter Paradise."
Hadith Referenceالمعجم الكبير للطبراني / باب الواو / 18408