The Sufficient (Vol 4) · Hadith 1112 (#Ḥadīth #9)
Chapter 72 | The Case of One Who Performs al-Hajj on Behalf of His Relatives, Partially or Altogether
9ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ مُحَمَّدِ بْنِ إِسْمَاعِيلَ قَالَ سَأَلْتُ أَبَا الْحَسَنِ (عَلَيْهِ السَّلاَم) كَمْ أُشْرِكُ فِي حَجَّتِي قَالَ كَمْ شِئْتَ.
9. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Muhammad ibn ‘Isma’il who has said the following: “I once asked abu al-Hassan , as to with how many people I can share my al-Hajj. He (the Imam) said, ‘You can share with whatever number of people you want.’”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).