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.
[Sahih Muslim Book 39 Hadith 3]