Sahih Al-Bukhari, Vol. 4, Hadith No. 41

Narrated Abdullah Bin Masud (Radi-allahu-anhu) : I Asked Allah's Messenger, "O Allah's Messenger, What is The Best Deed ?". He Replied, "To Offer Salaat (Prayers) At Their Early Fixed Stated Times". I Asked, "What's Next in The Goodness?". He Replied, "To Be Good & Dutiful To Your Parents". I Further Asked, "What's Next in The Goodness?". He Replied, "To Participate in Jihad in Allah's Cause". I Did Not Ask Him Anymore & If I Did, He Would Have Told Me More...

Surah Al-Bakarah, Ayah-191, Holy Quran

And kill the infidels wherever you find and turn them out from the place where from they turned you out; and
their mischief is more grievous than killing. And if they fight them near the sacred mosque unless they fight
you therein, and they fight against you then kill, them. This is the only punishment of infidels...