Various traditions may differ in how Nikah is performed because different groups accept different texts as authoritative. Therefore, Sunnis will likely accept the hadith of Muhammad al-Bukhari, while Shia will have their own collections, for example Furu al-Kafi, thus producing different procedures. This contract requires the consent of both parties. There is a tradition, outside of the religion, in some Muslim countries to pre-arrange a marriage for young children. However, the marriage still requires consent for the wedding to legally take place.