The Chapter of Ritual Baths (Ghusl)
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 19
وَ رُوِيَ: «أَنَّ مَنْ قَتَلَ وَزَغاً فَعَلَيْهِ اَلْغُسْلُ.
It is narrated: 'Whoever kills a gecko (lizard) must perform ghusl (ritual bathing).'.
- Ṣaḥīḥ al-Faqīh