Sahih Muslim
The Book on Government (Kitab Al-Imara)
Book Number: 020 / Hadith Number: 4639
It has been narrated on the authority of Anas b. Malik that the Messenger of Allah (may peace be upon him) said: Leaving (for Jihad) in the way of Allah in the morning or in the evening (will merit a reward) better than the world and all that is in it.