86. hadíth
وَ قَالَ عَلَيْهِ اَلسَّلاَمُ: "مَنْ كَانَ يَدِينُ بِدِينِ قَوْمٍ لَزِمَتْهُ أَحْكَامُهُمْ".
And Imam (a.s) said: "Whoever follows the religion of a people is bound by their rulings."
Man Lā Yaḥḍuruh al-Faqīh
Shaykh Muḥammad b. ʿAlī al-Ṣaduq
Book of Marriage (Nikah)
Chapter on What Allah (swt), the Almighty, Has Made Permissible and Prohibited in Marriage
A fordítás angol nyelvű (Bab Ul Qaim Publications), forrás: Thaqalayn.net.