١٧ـ مُحَمَّدُ بْنُ يَحْيَى رَفَعَهُ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلاَم) قَالَ سُئِلَ عَنْ رَجُلٍ مَاتَ وَلَهُ ابْنٌ لَمْ يَدْرِ أَ حَجَّ أَبُوهُ أَمْ لا قَالَ يَحُجُّ عَنْهُ فَإِنْ كَانَ أَبُوهُ قَدْ حَجَّ كُتِبَ لأَبِيهِ نَافِلَةً وَلِلابْنِ فَرِيضَةً وَإِنْ كَانَ أَبُوهُ لَمْ يَحُجَّ كُتِبَ لأَبِيهِ فَرِيضَةً وَلِلابْنِ نَافِلَةً.
17. Muhammad ibn Yahya has narrated from in a marfu‘ manner who has said the following: “I once asked abu ‘Abd Allah , about a man who dies and has a son who does not know if his father has performed al-Hajj or not. He (the Imam) said, ‘He performs al-Hajj on his behalf, if his father has performed al-Hajj, it is written as optional al-Hajj for him and an obligatory al-Hajj for his son; and if his father has not performed al-Hajj, it is written obligatory for his father and optional for the son.’” 