Muwatta Malik, Book 45, Hadith 6 (USC-MSA)

Malik related to me from Hisham ibn Urwa from his father that the Messenger of Allah, may Allah bless him and grant him peace, said, "No one leaves Madina preferring to live elsewhere, but that Allah will give it better than him in place of him."

وَحَدَّثَنِي مَالِكٌ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ لاَ يَخْرُجُ أَحَدٌ مِنَ الْمَدِينَةِ رَغْبَةً عَنْهَا إِلاَّ أَبْدَلَهَا اللَّهُ خَيْرًا مِنْهُ ‏" ‏ ‏.‏

sunnah.com

also referenced under: Book 45, Hadith 1606 (In-Book)