Yahya related to me from Malik from Nafi that Abdullah ibn Umarsaid that the Messenger of Allah, may Allah bless him and grant himpeace, forbade travelling with a Qur'an in the land of the enemy.Malik commented, "That is out of fear that the enemy will get hold ofit."
USC-MSA web (English) reference: Book 21, Hadith 7
Arabic reference: Book 21, Hadith 968