Chapter on Khums
Man Lā Yaḥḍuruh al-Faqīh|Volume 2|Book 1|Chapter 7
وَ رَوَى مُحَمَّدُ بْنُ مُسْلِمٍ عَنْ أَحَدِهِمَا عَلَيْهِمَا اَلسَّلاَمُ قَالَ: «إِنَّ أَشَدَّ مَا فِيهِ اَلنَّاسُ يَوْمَ اَلْقِيَامَةِ أَنْ يَقُومَ صَاحِبُ اَلْخُمُسِ فَيَقُولَ يَا رَبِّ خُمُسِي وَ قَدْ طَيَّبْنَا ذَلِكَ لِشِيعَتِنَا لِتَطِيبَ وِلاَدَتُهُمْ أَوْ لِتَزْكُوَ وِلاَدَتُهُمْ ».
Muhammad ibn Muslim narrated from one of them (Imam Muhammad ibn Ali Al-Baqir or Imam Jafar ibn Muhammad Al-Sadiq عليه السلام) who said: "The most severe situation for people on the Day of Resurrection will be when the rightful owner of Khums stands and says, 'O Lord عز وجل, where is my Khums?' We have made it permissible for our Shia so that their offspring may be purified or so that their lineage may be pure."
- Ṣaḥīḥ al-Faqīh