Musannaf Ibn Abi Shaybah 22692 — The protected zone of wells: how many

It is narrated from Bilal bin Yahya al-Absi (may Allah have mercy on him) that the Prophet (peace and blessings be upon him) said: "There is no enclosing except for three things: the enclosure of a well, and the enclosure of people sitting in a gathering." (The third thing is not mentioned here, but it is in other books of hadith, and it is tawl al-faras, meaning the enclosure of the place where a man tethers his horse.)