It is narrated from Sayyiduna Abdullah bin Amr bin al-As (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "I saw (in a dream) as if the pillar of the Book of Allah was pulled out from beneath my pillow, so I followed it with my gaze, and it was a radiant light that was taken towards al-Sham. Behold! When trials occur, faith will be in al-Sham." This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it.