Hadith

This hadith is good for those who are still doubtful to spend their time for khuruj fi sabilillah:

Abu Abs r.a. narrates that Rasul saw said whoever´s feet become dusty in the path of Allah, Allah will prohibit this feet from jahanam (Musnad Ahmad)

For those who like to go tourism:

Abu Umama ra said one man asked Rasul saw: Allow me to travel as tourist. Rasul saw answered: Tourism for my ummat is to strive in the path of Allah (Abu Dawud)