Chapter on Temporary Marriage (Mutʿah)
Man Lā Yaḥḍuruh al-Faqīh|Volume 3|Book 3|Chapter 44
وَ قَالَ اَلرِّضَا عَلَيْهِ اَلسَّلاَمُ: "اَلْمُتْعَةُ لاَ تَحِلُّ إِلاَّ لِمَنْ عَرَفَهَا وَ هِيَ حَرَامٌ عَلَى مَنْ جَهِلَهَا".
Imam Ali ibn Musa Ar-Ridha عليه السلام said: "Temporary marriage (Mutah) is not lawful except for one who understands it, and it is forbidden for one who is ignorant of it."
- Ṣaḥīḥ al-Faqīh