Musannaf Ibn Abi Shaybah

Hazrat Abu Hurairah (may Allah be pleased with him) narrates that people asked, "O Messenger of Allah (peace be upon him)! Tell us of a deed that is equal to striving in the path of Allah (jihad)?" He replied, "You do not have the ability to do that." The people said, "O Messenger of Allah (peace be upon him)! Please tell us, perhaps we may be able to do it!" The Prophet (peace be upon him) said, "The example of the one who strives in the path of Allah is like that of a person who fasts continuously and stands in prayer at night, reciting Allah’s verses, without any negligence in his fasting and standing, until the warrior returns."