Qur'an 9:88 "The Messenger and those who believe with him , strive hard and struggle with their wealth and lives in Allah 's Cause. They are the ones who will have all the goodness, and they are the ones who will prosper"
Sahih Bukhari 4:52:50 "The Prophet said, 'A single endeavor of fighting in Allah 's Cause is better than the world and whatever is in it.'"