Sahih Muslim
The Book on Government (Kitab Al-Imara)
Book Number: 020 / Hadith Number: 4641
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.