Sahih al-Bukhari 2990
Book 56: Fighting for the Cause of Allah (Jihaad) · Narrated by `Abdullah bin `Umar
Arabic
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ، عَنْ مَالِكٍ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ ـ رضى الله عنهما ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم نَهَى أَنْ يُسَافَرَ بِالْقُرْآنِ إِلَى أَرْضِ الْعَدُوِّ.
English translation
Narrated `Abdullah bin `Umar:Allah's Messenger (ﷺ) forbade the people to travel to a hostile country carrying (copies of) the Qur'an
Reference: Sahih al-Bukhari 2990, Book of Fighting for the Cause of Allah (Jihaad). English translation by Dr. Muhammad Muhsin Khan.