Sahih Muslim Book 20, Hadith Number 4641.

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: A journey undertaken in the morning or evening (fond Jihad) in the way of Allah (will merit a reward) better than the world and all that is in it.