Sahih Muslim Book 20, Hadith Number 4609.

Chapter : It is forbidden to take the Qur’an to the land of the infidels when it is feared that it might fall into their hands.

It has been narrated on the authority of Ibn ‘Umar that the Messenger of Allah (may peace be upon him) said: Do not take the Qur’an on a journey with you, for I am afraid lost it should fall into the hands of the enemy. Ayyub (one of the narrators in the chain of transmitters) said: The enemy may seize it and may quarrel with you over it.