١ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ عِيسَى عَنِ الْحَسَنِ بْنِ مَحْبُوبٍ عَنْ سَعْدِ بْنِ أَبِي خَلَفٍ عَنْ أَبِي الْحَسَنِ مُوسَى (عَلَيهِ السَّلام) قَالَ قَالَ لِبَعْضِ وُلْدِهِ يَا بُنَيَّ عَلَيْكَ بِالْجِدِّ لا تُخْرِجَنَّ نَفْسَكَ مِنَ حَدِّ التَّقْصِيرِ فِي عِبَادَةِ الله عَزَّ وَجَلَّ وَطَاعَتِهِ فَإِنَّ الله لا يُعْبَدُ حَقَّ عِبَادَتِهِ.
1. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad ibn ‘Isa from al-Hassan ibn Mahbub from Sa’D ibn abu Khalaf from abu al-Hassan Musa  who to one of his sons has said the following: “My son, you must work hard and do not allow your soul to lead you out of a feeling of always falling short in worshipping Allah, the Most Majestic, the Most Holy, and in obedience to Him; Allah is not worshipped as truly as He should be worshipped.” 