Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: I asked the Prophet (peace and blessings be upon him): Which deed is the most excellent? He said: "Performing the prayer at its time, kindness to parents, and jihad in the path of Allah." And had I asked him for more, he (peace and blessings be upon him) would have told me more.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9781