Musnad Abu Ya'la al-Mawsili 109:213

Abu Khaythama narrated to us, Yazid narrated to us, Ibn Abi Dhi'b informed us, from Abd al-Rahman ibn 'Ata', from Abd al-Malik ibn Jabir ibn 'Atik, from Jabir ibn Abdullah, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "If a man speaks to a people, then turns away, it is a trust."