(2) باب مِنْ حَقِّ الْجُلُوسِ عَلَى الطَّرِيقِ رَدُّ السَّلاَمِ
Abu Sa'id Khudri reported Allah's Apostle (ﷺ) as saying:
Avoid sitting on the paths. They (the Companions) said: Allah's Messenger, we cannot help but holding our meetings (in these paths) and discuss matters (there). Thereupon Allah's Messenger (ﷺ) said: If you insist on holding meetings, then give the path its due right. They said: What are its due rights? Upon this he said: Lowering the gaze, refraining from doing harm, exchanging of greetings. commanding of good and forbidding from evil.
Reference: Sahih Muslim 2121 c
In-book reference: Book 39, Hadith 3
USC-MSA web (English) reference(deprecated numbering scheme): Book 26, Hadith 5376