Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: I asked the Messenger of Allah (peace and blessings be upon him): Which deed is the most excellent? He said: "Performing the prayer at the beginning of its time, kindness to parents, and jihad in the path of Allah."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9772