Sahih Muslim | Book 20 | Chapter 24

Narrated by It has been narrated on the authority of Ibn 'Umar who
It has been narrated on the authority of Ibn 'Umar who said: The Messenger of Allah (may peace be upon him) forbade that one should travel to the land of the enemy taking the Qur'an with him.

Narrated by It has been narrated on the authority of Abdullah b. Umar that the Messenger of Allah (may peace be upon him)
It has been narrated on the authority of Abdullah b. Umar that the Messenger of Allah (may peace be upon him) 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.

Narrated by It has been narrated on the authority of Ibn 'Umar that the Messenger of Allah (may peace be upon him)
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.