Maliks Muwatta Book 021, Hadith Number 001.

Section : Stimulation of Desire for Jihad.

Yahya related to me from Malik from Abu'z-Zinad from al-Araj from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, said "Someone who does jihad in the way of Allah is like someone who fasts and prays constantly and who does not slacken from his prayer and fasting until he returns."