Al-Kāfi - The Book of Haj

Chapter: What Suffices for Hajjata al-Islam and What Does Not Suffice? (The following Chapter is best explained by fatwa).

َّدُ بْنُ يَحْيَى رَفَعَهُ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلاَ٠) قَالَ سُئِلَ عَنْ رَجُلٍ ٠َاتَ وَلَهُ ابْنٌ لَ٠ْ يَدْرِ أَ حَجَّ أَبُوهُ أَ٠ْ لا قَالَ يَحُجُّ عَنْهُ فَإِنْ كَانَ أَبُوهُ قَدْ حَجَّ كُتِبَ لأَبِيهِ نَافِلَةً وَلِلابْنِ فَرِيضَةً وَإِنْ كَانَ أَبُوهُ لَ٠ْ يَحُجَّ كُتِبَ لأَبِيهِ فَرِيضَةً وَلِلابْنِ نَافِلَةً.

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.’” رفوع - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (7/166))