Imam Sadiq (a.s.) said: "My father said to me about his father (a.s.) that a man from Kufah wrote to his father viz. to al-Husayn-ibn-Ali (a.s.), asking him (a.s.) to inform him of the good of this world and that of the next. Then he (a.s.) wrote (in his reply): 'In the Name of Allah, the Beneficent, the Merciful.' After that: 'Verily, he who seeks the pleasure of Allah even while displeasing people, He suffices him in his affairs with people. But, he who seeks the pleasure of people while Allah is displeased, He leaves him to people (and he will be far from His Grace), Was-salam'."

Bihar-ul-Anwar, vol. 71, p. 208

Imam Ali-ibn-il-Husayn (a.s.) said: "He who acts according to what Allah has enjoined for him, is of the best people."

Al-Kafi, vol. 2, p. 81

Imam Sadiq (a.s.) said: "The one who loves for Allah, hates for Allah, and donates (things) for Allah, thus the one is of those whose Faith is complete."

Al-Kafi, vol. 2, p. 124

Imam Hasan Askari, the eleventh Imam, (a.s.) said: "There are no qualities above these two: Faith in Allah and being beneficial to Muslims."

Bihar-ul-Anwar, vol. 17, p. 218