It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "I saw the pillar of the Book (the Qur'an) being pulled out from under my pillow, so I followed it with my eyes, and it was a radiant light, until I thought it had fallen; then it was taken towards al-Sham. I interpreted this to mean that when trials (fitan) occur, faith will be in al-Sham."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7683