It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them) that the Messenger of Allah (peace and blessings be upon him) said: "Do not travel with the Qur'an to the land of the enemy; I fear that the enemy may disrespect the Qur'an."
Hadith Referenceالسنن المأثورة / باب الجهاد / 632
Hadith Takhrijصحیح مسلم، الامارہ، باب النہی عن یسافر بالمصحف ...... الخ، رقم: 1869۔