Abu Sa'id Al-Khudri (May Allah be pleased with him) reported:
The Prophet (ﷺ) said, "Beware of sitting on roads (ways)." The people said: "We have but them as sitting places." Messenger of Allah (ﷺ) said, "If you have to sit there, then observe the rights of the way". They asked, "What are the rights of the way?" He (ﷺ) said, "To lower your gaze (on seeing what is illegal to look at), and (removal of harmful objects), returning greetings, enjoining good and forbidding wrong".[Al-Bukhari and Muslim].
Arabic/English book reference: Book 1, Hadith 190