Piety through abstinence and devotion
Ṣifāt al-Shīʿa|Volume 1|Book 1|Chapter 12
حَدَّثَنِي مُحَمَّدُ بْنُ مُوسَى اَلْمُتَوَكِّلُ رَحِمَهُ اَللَّهُ عَنْ أَحْمَدَ بْنِ عَبْدِ اَللَّهِ عَنْ أَبِي عَبْدِ اَللَّهِ ع يَقُولُ وَ اَللَّهِ مَا شِيعَةُ عَلِيٍّ ص إِلاَّ مَنْ عَفَّ بَطْنُهُ وَ فَرْجُهُ وَ عَمِلَ لِخَالِقِهِ وَ رَجَا ثَوَابَهُ وَ خَافَ عِقَابَهُ.
Mohammed bin Musa bin al-Mutawakkil, Allah may have mercy upon him, narrated to me from Ahmed bin Abdullah… that Abu Abdullah عليه السلام said: By Allah I swear, the Shia of Ali are only those who abstain from the food and the sexual appetites, work sincerely for the Creator, hope for gaining His reward, and fear from His punishment.