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) forbade taking the Noble Qur'an along when traveling to enemy territory, because there is a fear that it may fall into the hands of the enemy.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 5293
Hadith Gradingحکم دارالسلام:إسناده صحيح ، م : 1535 .