Abdullah bin Numayr عبد الله بن نمير · The Chapters on Jihad

“Whoever goes out in the cause of Allah will have the equivalent of the dust that got on him, in musk, on the Day of Resurrection.”

It was narrated from Ibn ‘Umar that the Messenger of Allah (ﷺ) forbade traveling with the Qur’an to the land of the enemy, lest the enemy gets hold of it.