Abu Saeed Khudri was approached during the nights of al-Harrah by a man who consulted him about leaving Madinah, complaining to him about its high prices and his large family, and informing him that he could not endure the hardship and harshness of Madinah.Abu Saeed said to him, "Woe to you, I will not advise you to do that. I heard the Messenger of Allah ﷺ say, 'No one endures its harshness and dies there but I will be an intercessor or a witness for him on the Day of Resurrection, provided he is a Muslim.'"
أبا سعيد الخدري ليالي الحرة فاستشاره في الجلاء من المدينة، وشكا إليه أسعارها وكثرة عياله، وأخبره أن لا صبر له على جهد المدينة ولأوائها فقال له: ويحك لا آمرك بذلك إني سمعت رسول الله ﷺ يقول: لا يصبر على لأوائها فيموت إلا كنت له شفيعا أو شهيدا يوم القيامة إذا كان مسلما.
Muslim narrated it in the book of Hajj (13:74:477) from Qutayba bin Saeed, who said, Layth narrated to us, from Saeed bin Abu Saeed, from Abu Saeed the freedman of Mahri, and he mentioned it.His statement "the nights of the Harrah" refers to the Harrah of Madinah, where there was a great massacre among the people of Madinah, in which more than three hundred sons of the Migrants and the Helpers were killed, among them a group of those who had accompanied the Prophet ﷺ. This is what Ibn Abdul-Barr mentioned in his book Al-Istiab, in the biography of Maqil bin Sinan Ashjai, who was killed in the Harrah.The cause of this battle was that the people of Madinah disliked the pledge of allegiance given to Yazid bin Muawiya. When he assumed the caliphate, Yazid bin Muawiya sent Muslim bin Uqba with a huge army from the people of Syria to fight the people of Madinah. That army then proceeded to Makkah to fight Ibn Zubayr. Muslim bin Uqba died, and command of the army passed to Husayn bin Numayr, who besieged Ibn Zubayr. The Kaaba was burned until its wall collapsed and its roof fell in. While they were in that state, news reached them of the death of Yazid bin Muawiya, so they dispersed. Ibn Zubayr remained in Makkah until the time of Hajjaj bin Yusuf, who killed Ibn Zubayr, and thereafter the Hijaz and all the Islamic lands came under the rule of Banu Umaya.As for what the Shia historians mentioned, that the number of those killed on the Day of the Harrah reached four thousand, or even ten thousand, all of that is falsehood, fabrication, and slander.