It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Al-Sham is the chosen land of Allah among His lands; He selects to it His chosen ones from among His servants. So whoever leaves al-Sham for elsewhere does so because of (Allah's) displeasure, and whoever enters it does so because of mercy."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7687