The Chapter of Ritual Baths (Ghusl)
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 19
وَ رُوِيَ: «أَنَّ مَنْ قَصَدَ إِلَى مَصْلُوبٍ فَنَظَرَ إِلَيْهِ وَجَبَ عَلَيْهِ اَلْغُسْلُ عُقُوبَةً.
It is narrated: 'Whoever deliberately goes to look at a crucified person must perform ghusl (ritual bathing) as a form of penance.'.
- Ṣaḥīḥ al-Faqīh