It is narrated from Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) that he used to say: "The flourishing of Bayt al-Maqdis will be the ruin of Madinah (Yathrib); the ruin of Madinah will be the sign of the outbreak of the great battle (al-malhamah); the outbreak of the great battle will lead to the conquest of Constantinople; and the conquest of Constantinople will be the precursor of the emergence of the Dajjal." The narrator said: Then Mu'adh (may Allah be pleased with him) struck the shoulder of Umar bin al-Khattab (may Allah be pleased with him) and said: "By Allah, this is as true as your sitting here is true." Although this hadith is mawquf, its chain is sahih (authentic) on the condition of its narrators, and it is befitting of the musnad hadith that preceded it.