My father, Allah may have mercy upon him, narrated to us from Ahmed bin Idris from Mohammed bin Ahmed from Ibn Abi Umair that one of the Imams عليه السلام said: Some of you offer more prayers than others do. Some perform the hajj more often than others do. Some give alms more than others do. Some observe the fasting more than others do. The best of you, however, are the most knowledgeable.