Musnad Ahmad 307:22

'Affan narrated to us, 'Abd al-Wahid ibn Ziyad narrated to us, 'Uthman ibn Hakim narrated to us, he said: Ishaq ibn 'Abd Allah ibn Abi Talha narrated to me, he said: My father narrated to me, he said: Abu Talha said: We were sitting in the courtyards, and the Messenger of Allah (may Allah bless him and grant him peace) passed by us and said: "What is the matter with you and the sittings of the pathways? Avoid the sittings of the pathways." He said: We said: O Messenger of Allah, we did not sit for any harm; we are discussing and talking. He said: "Then give the sittings their right." We said: And what is their right? He said: "Lowering the gaze, returning the greeting, and good speech."