Musnad Abu Ya'la al-Mawsili 109:110

Abu Hammam narrated to us, he said: Al-Mughirah ibn Saqlab narrated to me, he said: Ma'qal ibn 'Ubaydullah informed us, from 'Amr ibn Dinar, from Jabir, he said: The Messenger of Allah (peace be upon him) said: "Whoever guarantees for me what is between his two jaws and what is between his two legs, I guarantee Paradise for him."