مشكوة المصابيح Mishkat al-Masabih كتاب الجهاد The Book of Jihad
(بَيَانُ فَتْحِ رُومَا)

(Statement on the conquest of Rome)

1 hadith
Hadith 3862
وَعَنْهُ قَالَ: سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ: «سَتُفْتَحُ عَلَيْكُمُ الرُّومُ وَيَكْفِيكُمُ اللَّهُ فَلَا يَعْجِزْ أَحَدُكُمْ أَنْ يَلْهُوَ بِأَسْهُمِهِ» . رَوَاهُ مُسلم
He told that he heard God's Messenger say, “The Byzantines will be defeated at your hands and God will defend you, but let none of you be so careless as not to employ his arrows.”* * i.e. they must not neglect to practise archery. The idea is that although God defends them, this does not absolve them from effort. Muslim transmitted it.
Hadith Reference Mishkat al-Masabih / The Book of Jihad / Hadith: 3862
Hadith Grading الألبانی: صَحِيح  |  زبیر علی زئی: صحيح
Hadith Takhrij ´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «رواه مسلم (1918/168)»