The Messenger of Allah (ﷺ) forbade that one should travel to the land of the enemy taking the Qur'an with him.
Sahih Muslim Book 33, Hadith 135
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Sahih Muslim Book 33, Hadith 134 Next Hadith → It has been narrated on the authority of Abdullah b. Umar that the Messenger of Allah (ﷺ) used to forbid that one should travel to the land of the enemy taking the Qur'an (with him) lest it should fall into the hands of the enemy.

Sahih Muslim Book 33, Hadith 136