It is narrated from Hazrat Abu Umamah (may Allah be pleased with him) that the Day of Judgment will not be established until the best people of Iraq move to Sham and the worst people of Sham move to Iraq, and the Holy Prophet (peace and blessings be upon him) said: "You must hold fast to Sham."
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 22145
Hadith Gradingحکم دارالسلام:إسناده ضعيف، أبو المشاء لقيط بن المشاء يخطئ ويخالف