Narrated 'Abdullah: Nafi narrated to me that 'Abdullah said that Allah' s Messenger (ﷺ) forbade the Shighar. I asked Nafi', "What is the Shighar?" He said, "It is to marry the daughter of a man and marry one' s daughter to that man (at the same time) without Mahr (in both cases); or to marry the sister of a man and marry one' s own sister to that man without Mahr." Some people said, "If one, by a trick, marries on the basis of Shighar, the marriage is valid but its condition is illegal." The same scholar said regarding Al-Mut' a, "The marriage is invalid and its condition is illegal." Some others said, "The Mut' a and the Shighar are permissible but the condition is illegal."