The best deed is to perform Salat (prayer) at its proper time

227. ´Abdullah bin Mas´ud narrated: I asked the Messenger of Allah salla alayhi wa sallam, ´´Which deed is best?´´ He replied, ´´Performing prayer at its due tim.´´ I asked, ´´What is next?´´ He replied, ´´Being dutiful to parents.´´ I again asked, ´´What is next?´´ He replied, ´´Fighting in Jihad in the Cause of Allah.´´ Then I stopped asking him for more because I did not want to overburden him.