Sahih Bukhari Volume 9, Book 90, Hadith 6962

حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، عَنْ عُبَيْدِ اللَّهِ، قَالَ حَدَّثَنِي نَافِعٌ، عَنْ عَبْدِ اللَّهِ ـ رضى الله عنه ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم نَهَى عَنِ الشِّغَارِ‏.‏ قُلْتُ لِنَافِعٍ مَا الشِّغَارُ قَالَ يَنْكِحُ ابْنَةَ الرَّجُلِ وَيُنْكِحُهُ ابْنَتَهُ بِغَيْرِ صَدَاقٍ، وَيَنْكِحُ أُخْتَ الرَّجُلِ وَيُنْكِحُهُ أُخْتَهُ بِغَيْرِ صَدَاقٍ‏.‏ وَقَالَ بَعْضُ النَّاسِ إِنِ احْتَالَ حَتَّى تَزَوَّجَ عَلَى الشِّغَارِ، فَهْوَ جَائِزٌ، وَالشَّرْطُ بَاطِلٌ‏.‏ وَقَالَ فِي الْمُتْعَةِ النِّكَاحُ فَاسِدٌ، وَالشَّرْطُ بَاطِلٌ‏.‏ وَقَالَ بَعْضُهُمُ الْمُتْعَةُ وَالشِّغَارُ جَائِزٌ، وَالشَّرْطُ بَاطِلٌ‏.

Narrated By 'Abdullah : Nafi narrated to me that 'Abdullah said that Allah's Apostle 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."