The Sufficient (Vol 2) · Hadith 2238 (#Ḥadīth #18)
Chapter 15 | Response to Sneezing
18ـ أَبُو عَلِيٍّ الأشْعَرِيُّ عَنْ بَعْضِ أَصْحَابِهِ عَنِ ابْنِ أَبِي نَجْرَانَ عَنْ بَعْضِ أَصْحَابِنَا عَنْ أَبِي عَبْدِ الله (عَلَيهِ السَّلام) قَالَ عَطَسَ رَجُلٌ نَصْرَانِيٌّ عِنْدَ أَبِي عَبْدِ الله (عَلَيهِ السَّلام) فَقَالَ لَهُ الْقَوْمُ هَدَاكَ الله فَقَالَ أَبُو عَبْدِ الله (عَلَيهِ السَّلام) فَقُولُوا يَرْحَمُكَ الله فَقَالُوا لَهُ إِنَّهُ نَصْرَانِيٌّ فَقَالَ لا يَهْدِيهِ الله حَتَّى يَرْحَمَهُ.
18. Abu Ali al-Ash’ari has narrated from certain individuals of his people from ibn abu Najran from certain individuals of our people from abu ‘ Abd Allah who has said the following: “Once a Christian man sneezed in the presence of Abu ‘Abdillah and the people said, ‘May Allah guide you.’ Abu ‘Abd Allah said, ‘Say, “May Allah grant you mercy.’” They said, ‘He is a Christian.’ The Imam said, ‘Allah will not guide him until He grants him mercy.’”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).