It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Do not take the Noble Qur'an with you when going on a journey; I fear that it may fall into the hands of the enemy."
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 4507