Chapter on Touching the Deceased
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 25
وَ سَأَلَهُ: عَنِ اَلنَّصْرَانِيِّ يَكُونُ فِي اَلسَّفَرِ وَ هُوَ مَعَ اَلْمُسْلِمِينَ فَيَمُوتُ قَالَ «لاَ يُغَسِّلُهُ مُسْلِمٌ وَ لاَ يَدْفِنُهُ وَ لاَ كَرَامَةَ وَ لاَ يَقُومُ عَلَى قَبْرِهِ وَ إِنْ كَانَ أَبَاهُ.
The Imam was asked about a Christian who dies while traveling among Muslims. Imam عليه السلام said: "A Muslim should not wash him, nor bury him, nor give him any honor, and should not stand by his grave, even if he was his father."
- Ṣaḥīḥ al-Faqīh