Narrated Abdullah bin Masud: I asked Allah's Apostle, "O Allah's Apostle! What is the best deed?" He replied, "To offer the prayers at their early stated fixed times." I asked, "What is next in goodness?" He replied, "To be good and dutiful to your parents." I further asked, what is next in goodness?" He replied, "To participate in Jihad in Allah's Cause." I did not ask Allah's Apostle anymore and if I had asked him more, he would have told me more.
[Hadith from Sahih Bukhari, Book No. 52: Fighting for the Cause of Allah (Jihaad), Hadith No. 41]