It is narrated from Sayyiduna Urwah bin Mudarris al-Ta'i (may Allah be pleased with him) that: I came to the Messenger of Allah (peace and blessings be upon him) while he was standing at Muzdalifah, and I said: O Messenger of Allah, I have come from the two mountains of Tayyi'. I have exhausted my mount and put myself to hardship. By Allah, there was no hillock I passed by without standing upon it. So has my Hajj been accomplished? The Messenger of Allah (peace and blessings be upon him) said: "Whoever catches this prayer with us, having reached Arafat before that by night or by day, has fulfilled his rites and his Hajj is complete." This hadith is sahih (authentic) on the condition of all the imams of hadith, and it is one of the important principles of Islam. Imam Bukhari and Imam Muslim (may Allah have mercy on them both) refrained from recording it on the basis of their principle that no one narrated from Urwah bin Mudarris except Amir al-Sha'bi, whereas we have found a narration of Urwah bin al-Zubayr bin al-Awwam, who narrated hadith from him: