The Chapter on Tayammum (Dry Ablution)
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 22
وَ قِيلَ لِرَسُولِ اَللَّهِ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ يَا رَسُولَ اَللَّهِ إِنَّ فُلاَناً أَصَابَتْهُ جَنَابَةٌ وَ هُوَ مَجْدُورٌ فَغَسَّلُوهُ فَمَاتَ فَقَالَ «قَتَلُوهُ أَلاَّ سَأَلُوا أَلاَّ يَمَّمُوهُ إِنَّ شِفَاءَ اَلْعِيِّ اَلسُّؤَالُ.
It was said to the Messenger of Allah صلى الله عليه وعلى آله وسلم: 'O’ Messenger of Allah صلى الله عليه وعلى آله وسلم, so-and-so became junub (ritually impure due to sexual discharge) and had smallpox, so they washed him and he died.' Imam عليه السلام said: 'They killed him! Why did they not ask? Why did they not perform tayammum for him? Surely, the cure for ignorance is asking questions.'
- Ṣaḥīḥ al-Faqīh