وَعَنِ ابْنِ عُمَرَ
قَالَ: نَهَى رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: إِن يُسَافَرَ بِالْقُرْآنِ إِلَى أَرْضِ الْعَدُوِّ وَفِي رِوَايَةٍ لِمُسْلِمٍ: «لَا تُسَافِرُوا بِالْقُرْآنِ فَإِنِّي لَا آمن أَن يَنَالهُ الْعَدو»
God’s-messenger forbade taking the Qur’an into enemy territory. A version by Muslim has, “Do not take the Qur’an with you when travelling, for I cannot guarantee that the enemy will not get it.” (Bukhari and Muslim.)
Mishkat al-Masabih 2101, Book 9, The Excellent Qualities of the Qur'an, Hadith 87. 1 min read