On the prohibition against travelling with a copy of the Qur'an to enemy territory when it is feared that it might fall into the hands of the enemy

Riyad as-Salihin (The Meadows of the Righteous)

by Imam Nawawi

363. Chapter: On the prohibition against travelling with a copy of the Qur'an to enemy territory when it is feared that it might fall into the hands of the enemy

1794. 'Abdullah ibn 'Umar said, "The Messenger of Allah, may Allah bless him and grant him peace, forbade travelling with the Qur'an to enemy territory." [Agreed upon]