It is narrated from Sayyiduna Umayr bin Qatadah al-Laythi (may Allah be pleased with him) that a man said: "O Messenger of Allah, which prayer is best?" He (peace and blessings be upon him) said: "Standing long in worship." He asked: "Which charity is best?" He (peace and blessings be upon him) said: "Charity given through the effort of one who has little." He asked: "Who is the most complete of the believers?" He (peace and blessings be upon him) said: "The one with the best character."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14175