حَدَّثَنَا عَبْدُ الرَّحْمَنِ حَدَّثَنَا مَالِكٌ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ نَهَى أَنْ يُسَافَرَ بِالْقُرْآنِ إِلَى أَرْضِ الْعَدُوِّ مَخَافَةَ أَنْ يَنَالَهُ الْعَدُوُّ
مسند امام احمد بن حنبل · Hadith 5293
It was narrated from [bn 'Umar that the Messenger of Allah (PBUH) forbade travelling with the Qur'an to the land of the enemy, lest the enemy get hold of it.
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020