From Sahih Bukhari (Hadith 3123):
Narrated Abu Huraira:Allah's Messenger (ﷺ) said, "Allah guarantees him who strives in His Cause and whose motivation for going out is nothing but Jihad in His Cause and belief in His Word, that He will admit him into Paradise (if martyred) or bring him back to his dwelling place, whence he has come out, with what he gains of reward and booty
Reference: Bukhari 3123