Muwatta Imam Malik Book of Jihad, Hadith 7

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 ﷺ أَنْ يُسَافَرَ بِالْقُرْآنِ إِلَى أَرْضِ الْعَدُوِّ .