Musnad Ahmad 33:675

Abu Salamah al-Khuza'i narrated to us, and Sulayman ibn Bilal narrated to us, from 'Abd al-Rahman ibn 'Ata', that 'Abd al-Malik ibn Jabir ibn 'Atik informed him, that Jabir ibn 'Abd Allah informed him, that he heard the Prophet, peace and blessings of Allah be upon him, saying: "When a person speaks a statement, and the speaker looks around him, then it is a trust."