حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّهُ قَالَ نَهَى رَسُولُ اللَّهِ صلى الله عليه وسلم أَنْ يُسَافَرَ بِالْقُرْآنِ إِلَى أَرْضِ الْعَدُوِّ ‏.‏

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." Translation Not Available

Book Ref: Muwatta Imam Malik Book 21 Hadith 968
Web Ref:  Muwatta Imam Malik Book 21 Hadith 7