Musnad Abu Ya'la al-Mawsili 148:7

Abu Bakr ibn Abi Shaybah narrated to us, Yunus narrated to us, from Layth, from Yazid, from Ibn Sinan, from Anas ibn Malik, from the Prophet (peace and blessings of Allah be upon him), that he said: "Guarantee for me six things, and I will guarantee Paradise for you." They said: "What are they?" He said: "When one of you speaks, let him not lie; when he promises, let him not break it; and when he is entrusted, let him not betray. Lower your gazes, restrain your hands, and guard your private parts."