Musannaf Ibn Abi Shaybah 22684 — The protected zone of wells: how many

Muhammad bin Ishaq (may Allah have mercy on him) said: I asked Abu Bakr bin Muhammad bin Amr bin Hazm (may Allah have mercy on him) about the enclosure of a well. He said: In the time of pre-Islamic ignorance it was fifty cubits on its surrounding sides, and between two wells it was one hundred. When the era of Islam came, it was seen that less than that also suffices; so twenty-five cubits was set for each well, fifty cubits for its surroundings.