Muwatta Malik 965
Jihad
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 .
Yahya related to me from Malik from Nafi that Abdullah ibn Umar said that the Messenger of Allah, may Allah bless him and grant him peace, 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
Grading: Salim al-Hilali: Sahih
Text from the public-domain hadith-api dataset. Numbering follows that dataset and can differ by a few from some printed editions — check the wording, not only the number.