Sunan Abi Dawud Book 42, Hadith 44

A king of the foreigners will come and prevail over all the cities except Damascus.

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The Romans will enter the Levant and stay there for forty days, and no place will be saved from them but Damascus and 'Uman.

Sunan Abi Dawud Book 42, Hadith 43
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The place of the assembly of Muslims at the time of war will be in a land called al-Ghutah.

Sunan Abi Dawud Book 42, Hadith 45