The Sufficient (Vol 2) · Hadith 1009 (#Ḥadīth #19)
Chapter 112 | The Major Sins
19ـ يُونُسُ عَنْ إِسْحَاقَ بْنِ عَمَّارٍ قَالَ قُلْتُ لأبِي عَبْدِ الله (عَلَيهِ السَّلام) الْكَبَائِرُ فِيهَا اسْتِثْنَاءُ أَنْ يَغْفِرَ لِمَنْ يَشَاءُ قَالَ نَعَمْ.
19. Yunus has narrated from Ishaq ibn ‘ Ammar who has said the following: “Once I asked Abu ‘Abdillah ‘Does the exception apply to the major sins and Allah may chose to forgive (whichever He may so choose)?’ The Imam said, ‘Yes, it does apply.’”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).