Grading: Its chain is "da'if jiddan" (extremely weak).
Technical note / Defect ('illah): Umar bin Qays (Abu Hafs al-Makki, known as Sandal) is "matruk al-hadith" (abandoned). Although it is also narrated through other routes as "mawsul marfu'" (as will come in the takhrij), none of them is sahih. Imam al-Daraqutni narrated it in "al-Sunan" (4519) by way of al-Hasan bin Abi Ja'far, from Ma'mar, from al-Zuhri, from Sa'id bin al-Musayyab, from Abu Hurayrah (may Allah be pleased with him) as "marfu'", but al-Hasan bin Abi Ja'far is "da'if" or "munkar al-hadith".

Corroborating chains and supporting reports: This narration has already passed in the previous hadith through the sahih route of Ma'mar.

Technical note / Defect ('illah): Al-Daraqutni narrated it (4519) by way of Ibrahim bin Abi Ablah, from al-Zuhri, from Sa'id, from Abu Hurayrah as marfu', but its chain contains Muhammad bin Yusuf al-Muqri', who is accused of fabricating hadith.

Important point: Imam al-Daraqutni says: What is correct in this hadith is that it is "mursal" from Ibn al-Musayyab, and whoever made it "musnad" (connected) was mistaken.

Grading: Imam al-Bayhaqi says in "al-Sunan" (6/155): This narration is reported through Ma'mar and Ibrahim bin Abi Ablah, from al-Zuhri, from Sa'id, from Abu Hurayrah as marfu' and mawsul, but it is weak.

Technical note / Defect ('illah): Sufyan bin Husayn narrated it from al-Zuhri, from Sa'id bin al-Musayyab, from Damrah as marfu' (as in al-Daraqutni's al-Ilal: 1693), but Sufyan bin Husayn is weak in the narrations of al-Zuhri; Imam al-Daraqutni said that its being "mursal" is closer to the truth.

Corroborating chains and supporting reports: In this chapter there is a "mawquf" narration from Ibn Abbas (may Allah be pleased with them both) whose wording is: "The harim of a well is fifty cubits, and the harim of a spring is two hundred cubits."

Technical note / Defect ('illah): Yahya bin Adam narrated it in "al-Kharaj" (335) and al-Bayhaqi (6/257), but its chain contains Ibrahim bin Abi Yahya al-Aslami, who is "matruk al-hadith".

Grading: This is established as "sahih" through the marfu' hadith of Abu Hurayrah (Musnad Ahmad 16/10411 and others): "The harim of a well is forty cubits all around it, for the resting places of camels and sheep, and the traveller is the first to drink".