The Hour will not come until Almighty Allah ensures the [spiritual] conquest of Constantinople [Istanbul] and the Roman (lands) for believers through tasbih and takbir. (Daylami, al-Firdaws, 5/82, no: 7524; at-Tabarani, al-Mu`jam al-Kabir, 17/15,21)
Our Prophet (saas) stated: “They will [spiritually] conquer Constantinople with tasbih and takbir, and they will obtain booty the like of which has never been seen…” (Ibn Majah, Kitab Al-Fitan, p. 35)
Allah will purify him in a night. He will [spiritually] capture the Roman city [Istanbul] with takbir… (Muhyiddin ibn al-Arabi, al-Futuhat al- Makkiyah, section 366, Vol. 3, p. 327- 328)
Followers in far distant places will swear allegiance to Hazrat Mahdi (as). He will intellectually neutralize oppression and oppressors, and will stabilize countries, AND ALMIGHTY ALLAH WILL CAUSE HIM TO [SPIRITUALLY] CAPTURE ISTANBUL.”
(Al-Uqayli An-Najm al-saqib fi Bayan Anna al-Mahdi min Awladi Ali Ibn Abi Talib Ale't-Temam wa al-qamal)
The Prophet of Allah (saas) said:
“The Day of Judgment will not take place until a man from my Ahl al-Bayt, Hazrat Mahdi (as) rules [the world] HE [HAZRAT MAHDI (AS)] WILL [SPIRITUALY] CAPTURE ISTANBUL AND THE ,DJEBEL [ITS SEVEN HILLS].” (Mari’ bin Yusuf Karami Hanbali, Fawaid Fawaid al-Fikr fil Mahdi al-Montazar)
When Hazrat Mahdi (as) appears, even Muslims living in distant countries will express their love for and devotion to him. Our Prophet (saas) reveals in the hadith that Hazrat Mahdi (as) will spiritually capture Istanbul and its djebel. The term DJEBEL, or mountain, in the hadith refers to the seven hills of Istanbul. One of Istanbul’s distinguishing features is that it was built on seven hills. The idea of “7 hills” is a well-known one that immediately puts people in mind of Istanbul.