The Messenger of Allah ﷺ said, "Some men are calling their relatives away from Madinah, saying, 'Better lands, better lands,' yet Madinah is better for them, if only they knew. By the One in whose hand is the soul of Muhammad, no one endures its hardship and difficulty without my being a witness or an intercessor for him on the Day of Resurrection. By the One in whose hand is my soul, it expels its impure inhabitants just as the bellows expels the dross of iron. By the One in whose hand is the soul of Muhammad, no one leaves it out of distaste for it without Allah replacing him with someone better."
حدثنا ابن نمير قال حدثنا هاشم بن هاشم قال حدثنا أبو صالح مولى السعديين
رسول الله ﷺ إن رجالا يستنفرون عشائرهم يقولون الخير الخير والمدينة خير لهم لو كانوا يعلمون والذي نفس محمد بيده لا يصبر على لأوائها وشدتها أحد إلا كنت له شهيدا أو شفيعا يوم القيامة والذي نفسي بيده إنها لتنفي أهلها كما ينفي الكير خبث الحديد والذي نفس محمد بيده لا يخرج منها أحد راغبا عنها إلا أبدلها الله عز وجل خيرا منه
Its isnad is sahih. Abu Salih, the freed slave of the Saadis, also called Abu Salih Saadi and also Saadi, "there is no harm in him," as said by Abu Hatim. See Al-Jarh 9/392, no. 1854. Bukhari mentioned him in his Tarikh. Hashim bin Qasim bin Utbah bin Abu Waqqas Zuhri is trustworthy.The hadith was narrated by Bukhari, 4/89, no. 1874, Fath, in the virtues of Madinah, "Whoever turns away from Madinah," and Muslim, 2/1004, no. 1378, in Hajj, "Encouragement to reside in Madinah," and Tirmidhi, 5/722, no. 3924, and Malik, 2/887.