It is narrated from Sayyiduna Ma'iz al-Tamimi (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) was asked: Which deed is best? He (peace and blessings be upon him) said: "Faith in Allah alone, with no partner, then jihad, then an accepted Hajj, which surpasses all other deeds as much as the distance between the east and the west."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17940