ʿUyūn akhbār al-Riḍā
Hadith 285285 - وَبِهذَا الإِسناد عَنْ عَلِيِ عَلَيْهِ السَّلامُ قالَ: قالَالنَّبِيُ صَلَّى اللهُ عَلَيْهِ وَآلِهِ: مَن قَتَلَ حَيَّةً، فَقَدْ قَتَلَ كافِرَاً.
31-285 According to the same documentation, on the authority of Ali (a.s.), the Prophet (S) said, “Whoever kills a snake, it is as if he has killed an atheist.”