Al-Kāfi
Hadith 1952ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ مُحَمَّدِ بْنِ إِسْمَاعِيلَ عَنْ حَنَانِ بْنِ سَدِيرٍ عَنْ أَبِيهِ قَالَ قَالَ أَبُو جَعْفَرٍ (عَلَيهِ السَّلام) إِنَّ أَفْضَلَ الْعِبَادَةِ عِفَّةُ الْبَطْنِ وَالْفَرْجِ.
2. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Muhammad ibn Isma’il from Hanan ibn Sadir from his father who has said the following: “Abu Ja’far (a.s.) has said, ‘The best worship is to be chaste in the matters of stomach and genital organs.’”