Imam Al-Nawawi’s Riyad-us-Saliheen
Prohibition of Carrying the Qur’an into the Land of Enemy
1794. Ibn `Umar (May Allah be pleased with them) said: The Messenger of Allah (sallallaahu alayhi wa sallam) forbade travelling to the land of the enemy carrying the Qur’an.
[Al-Bukhari and Muslim].