The Source of Traditions on Imam al-Riḍā (Vol 2) · Hadith 237 (#Ḥadīth #237)

237 - وَبِإِسْنادِهِ قالَ: قالَ النَّبِي صَلَّى اللهُ عَلَيْهِوَآلِهِ: لا يَرى عَوْرَتِي غَيْرِ عَلِيِّ إِلاّ كافِرٌ.

31-237 According to the same documentation, the Prophet (S) said, “Should anyone but Ali look at my private parts he would be an atheist.”

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).