The Source of Traditions on Imam al-Riḍā (Vol 2) · Hadith 285 (#Ḥadīth #285)

285 - وَبِهذَا الإِسناد عَنْ عَلِيِ a.sُ قالَ: قالَالنَّبِيُ صَلَّى اللهُ عَلَيْهِ وَآلِهِ: مَن قَتَلَ حَيَّةً، فَقَدْ قَتَلَ كافِرَاً.

31-285 According to the same documentation, on the authority of Ali , the Prophet (S) said, “Whoever kills a snake, it is as if he has killed an atheist.”

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