It is narrated from Hazrat Bishr (may Allah be pleased with him) that he heard the Prophet saying: "Soon Constantinople will be conquered, its commander will be excellent and that army will be the best." The narrator says that Muslamah bin Abdul Malik called me and asked me about this hadith; I narrated it to him, so he participated in the jihad of Constantinople.
Hadith Referenceمسند احمد / تتمہ مُسْنَدِ الْكُوفِيِّينَ / 18957
Hadith Gradingحکم دارالسلام:إسناده ضعيف لجهالة عبدالله بن بشر، وقد اختلف على زيد بن الحباب فى اسمه واسم أبيه ونسبه