١٩ـ عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ ابْنِ مَحْبُوبٍ عَنْ سَعْدِ بْنِ أَبِي خَلَفٍ عَنْ أَبِي الْحَسَنِ (عَلَيهِ السَّلام) أَنَّهُ قَالَ فِي وَصِيَّةٍ لَهُ لِبَعْضِ وُلْدِهِ أَوْ قَالَ قَالَ أَبِي لِبَعْضِ وُلْدِهِ إِيَّاكَ وَالْمِزَاحَ فَإِنَّهُ يَذْهَبُ بِنُورِ إِيمَانِكَ وَيَسْتَخِفُّ بِمُرُوءَتِكَ.
19. A number of our people have narrated from Ahmad ibn Muhammad from ibn Mahbub from Sa’d ibn abu Khalaf from abu al-Hassan  who has said the following: “The Imam said in his will to one of his sons or that he said, ‘My father said to one of his sons: “Beware of playing jokes; it eliminates the light of your belief, and decreases your manhood.’” 