Yahya related to me from Malik from Nafi that Abdullah ibn Umar said that the Messenger of Allah, (ﷺ), forbade travelling with a Qur'an in the land of the enemy. Malik commented, "That is out of fear that the enemy will get hold of it."

حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّهُ قَالَ نَهَى رَسُولُ اللَّهِ صلى الله عليه وسلم أَنْ يُسَافَرَ بِالْقُرْآنِ إِلَى أَرْضِ الْعَدُوِّ ‏.‏