Sahih Muslim Book 20, Hadith Number 4633.

Chapter : The merit of Jihad and campaigning in the way of Allah.

Another version of the tradition narrated through a different chain of transmitters on the authority of Abu Huraira has the same wording as the previous tradition: “Allah takes care of one who goes out in the way of Allah” but ends in the words: “I would not lag behind any expedition which is undertaken to fight in the way of Allah, the Exalted.”