Musnad Abu Ya'la al-Mawsili 144:1

Jabarah ibn Mughallis narrated to us, he said: Hafs ibn Sabih al-Shaybani narrated to me—and Jabarah said: "He was among the most devout of people"—from Malik ibn Dinar, from Anas ibn Malik, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "If a man speaks to another, then looks around, it is a trust."