It is narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) said: "I am the leader of the Messengers, and (I say this) not out of pride; I am the Seal of the Prophets, and there is no pride; and I am the first to intercede and the first whose intercession will be accepted, and there is no pride (in this)."
Imam al-Tabarani (may Allah have mercy on him) said: "Only Salih bin Ata narrated this hadith from Ata, and only Ja'far bin Rabi'ah from Salih, and Bakr bin Mudar is alone in narrating it."