Sayyiduna Bishr al-Khath'ami (may Allah be pleased with him) narrates that he heard the Prophet (peace and blessings be upon him) say: "Constantinople will soon be conquered; its commander will be an excellent commander, and that army will be the best army." The narrator says: Maslamah bin Abd al-Malik called for me, and I narrated this hadith to him, and then he campaigned against Constantinople.
Ahmad, al-Bazzar and al-Tabarani recorded it, and its narrators are thiqat (trustworthy).
Sayyiduna Abu Qabil (may Allah be pleased with him) narrates: We came to Sayyiduna Abdullah bin Amr (may Allah be pleased with him), and he was asked: "Which city will be conquered first, Constantinople or Rome?" The narrator says: Sayyiduna Abdullah (may Allah be pleased with him) sent for his chest and took out a document from it. Sayyiduna Abdullah (may Allah be pleased with him) said: Once we were sitting around the Prophet (peace and blessings be upon him), writing, when the Prophet (peace and blessings be upon him) was asked: "Which of the two cities will be conquered (first), Constantinople or Rome?" The Prophet (peace and blessings be upon him) said: "The city of Heraclius will be conquered first." The narrator says: This means Constantinople.
Ahmad recorded it, and its narrators are the narrators of the Sahih, except the narrator Abu Qabil, and he is thiqah (trustworthy).
It is narrated from Sayyiduna Abu Tha'labah al-Khushani (may Allah be pleased with him), a Companion of the Prophet (peace and blessings be upon him), that he was in al-Fustat during the caliphate of Sayyiduna Mu'awiyah (may Allah be pleased with him), and Sayyiduna Mu'awiyah (may Allah be pleased with him) was preparing the people for the campaign against Constantinople. Sayyiduna Abu Tha'labah al-Khushani (may Allah be pleased with him) said: "By Allah, this Ummah will not be incapable of half a day. When you see Syria as the dining table of one man and his household, at that time Constantinople will be conquered." (Allamah al-Haythami says:) I say: Abu Dawud recorded part of this narration.
Ahmad recorded it, and its narrators are the narrators of the Sahih.
Sayyiduna Amr bin Awf (may Allah be pleased with him) narrates: I heard the Prophet (peace and blessings be upon him) say: "The Hour will not be established until there is a garrison of the Muslims at a place called Bulan. O Ali!" The narrator al-Muzani says: This refers to Sayyiduna Ali bin Abi Talib (may Allah be pleased with him). He said: "Here I am, O Messenger of Allah." The Prophet (peace and blessings be upon him) said: "Know that you will soon fight Banu al-Asfar (the Romans), and the believers after you will fight them. Then some of the Muslims, from the people of the Hijaz, will go out against them; they will be people who strive in the way of Allah, and the blame of any blamer will not take hold of them concerning Allah, until Allah Almighty conquers Constantinople and Rome for them, which will be by glorifying Allah (tasbih) and declaring His greatness (takbir). They will demolish the fortresses of both places and obtain a great deal of wealth, the like of which they had never obtained before, so much that they will divide it by the shieldful. Then someone will cry out: 'O people of Islam, the Dajjal has emerged in your lands and among your families.' The people will leave the wealth; some will take it and some will leave it, and the one who takes it will regret it and the one who leaves it will also regret it. Then they will say: 'Who is this person crying out?' and they will not know who he is. Then they will say: 'Send a scout to Ludd; if the Dajjal has emerged, he will bring you news of him.' They will go and look, but they will not see anything, and they will see the people quiet. They will say: 'The one who cried out only cried out at us. So be resolute and remain rightly guided. Let us all go out to Ludd; if the Dajjal is there, we will fight him until Allah Almighty judges between us and him, and He is the best of judges. And if the situation is otherwise, it is your land, your families and your armies; you will return to them.'" (Allamah al-Haythami says:) I say:
Ibn Majah recorded this narration in abridged form.
Al-Tabarani recorded it. Its chain contains a narrator, Kathir bin Abdullah, whom the majority have declared da'if (weak), while al-Tirmidhi declared his narration hasan (good).