Sahih Muslim Book 20, Hadith Number 4640.

Chapter : Merit of leaving for Jihad in the morning and evening.

It has been narrated on the authority of Sahl b. Sa’d as-Sa’idi that the Messenger of Allah (may peace be upon him) said: The journey undertaken by a person in the morning (for Jihad) in the way of Allah (will merit a reward) better than the world and all that is in it.