صَحِيحُ مُسْلِمٍ
Sahih Muslim 1869 a
The Book on Government
The prohibition of travelling with the Mushaf to the land of the disbelievers if there is the fear that it may fall into their hands.
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، قَالَ قَرَأْتُ عَلَى مَالِكٍ عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، قَالَ نَهَى رَسُولُ اللَّهِ صلى الله عليه وسلم أَنْ يُسَافَرَ بِالْقُرْآنِ إِلَى أَرْضِ الْعَدُوِّ .
It has been narrated on the authority of Ibn 'Umar who said: The Messenger of Allah (ﷺ) forbade that one should travel to the land of the enemy taking the Qur'an with him.
Sahih Muslim, 1869 aSahihصحيح