Chapter on Oaths, Vows, and Expiations
Man Lā Yaḥḍuruh al-Faqīh|Volume 3|Book 2|Chapter 38
وَ رَوَى اَلْعَلاَءُ عَنْ مُحَمَّدِ بْنِ مُسْلِمٍ قَالَ: سَأَلْتُهُ عَنِ اَلْأَحْكَامِ فَقَالَ "يَجُوزُ عَلَى كُلِّ دَيِّنٍ بِمَا يَسْتَحْلِفُونَ".
Al-Ala narrated from Muhammad ibn Muslim who said: I asked him about oaths. Imam عليه السلام said: "It is permissible to take an oath with every religious group according to what they regard as binding for oaths."
- Ṣaḥīḥ al-Faqīh