It is narrated from Sayyiduna Wathilah bin al-Asqa' (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) was speaking to Sayyiduna Hudhayfah bin al-Yaman and Sayyiduna Mu'adh bin Jabal (may Allah be pleased with them both), while they were consulting him about where to settle, and he pointed towards Syria. Then they asked him again, and he pointed towards Syria. Then they asked him yet again, and he pointed towards Syria and said: "Hold fast to Syria, for it is the best of Allah's lands; the chosen of His creation dwell in it. Whoever refuses it, let him go to his Yemen and drink from its pools, for Allah has guaranteed to me Syria and its people."
Hadith Referenceالمعجم الكبير للطبراني / باب الواو / 18357