The Sufficient (Vol 3) · Hadith 1402 (#Ḥadīth #12)
Chapter 45 | Things That Invalidate Salah (Prayer) Like Laughing, Invalidating Wudu’, Making a Gesture, Forgetting and So on
12ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ مُحَمَّدِ بْنِ الْحُسَيْنِ عَنْ صَفْوَانَ عَنِ الْعَلاَءِ عَنْ مُحَمَّدِ بْنِ مُسْلِمٍ عَنْ أَبِي جَعْفَرٍ (عَلَيْهِ الْسَّلام) قَالَ سَأَلْتُهُ عَنِ الرَّجُلِ يَلْتَفِتُ فِي الصَّلاَةِ قَالَ لاَ وَلاَ يَنْقُضُ أَصَابِعَهُ.
12. Muhammad ibn Yahya has narrated from Muhammad ibn al-Husayn from Safwan from al-‘Ala’ from Muhammad ibn Muslim who has said the following: “I once asked abu Ja‘far , if a man in Salah (prayer) can turn around. He (the Imam) said, ‘No, and he must not crack his fingers also.’”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).