It was narrated from Ibn ‘Umar that the Messenger of Allah (ﷺ) forbade traveling with the Qur’an to the land of the enemy, lest the enemy gets hold of it.
Sunan Ibn Majah Book 24, Hadith 127
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Sunan Ibn Majah Book 24, Hadith 126 Next Hadith → It was narrated from Ibn ‘Umar that the Messenger of Allah (ﷺ) used to forbid traveling with the Qur’an to the land of the enemy, lest the enemy gets hold of it.

Sunan Ibn Majah Book 24, Hadith 128