عَنْ أَبِي مُوسَى الْأَشْعَرِيِّ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «تَعَاهَدُوا الْقُرْآنَ فَوَالَّذِي نَفْسِي بِيَدِهِ لَهْوَ أَشَدُّ تَفَصِّيًا مِنَ الْإِبِلِ فِي عُقُلِهَا»

Ibn ‘Umar said that God’s-messenger forbade taking the Qur’ān into enemy territory.A version by Muslim has, “Do not take the Qur’ān with you when travelling, for I cannot guarantee that the enemy will not get it.”(Bukhārī and Muslim.)