Sunan an-Nasa'i
Sunan an-Nasa'i 3337
أَخْبَرَنَا هَارُونُ بْنُ عَبْدِ اللَّهِ، قَالَ حَدَّثَنَا مَعْنٌ، قَالَ حَدَّثَنَا مَالِكٌ، عَنْ نَافِعٍ، ح وَالْحَارِثُ بْنُ مِسْكِينٍ قِرَاءَةً عَلَيْهِ وَأَنَا أَسْمَعُ، عَنِ ابْنِ الْقَاسِمِ، قَالَ مَالِكٌ حَدَّثَنِي نَافِعٌ، عَنِ ابْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم نَهَى عَنِ الشِّغَارِ وَالشِّغَارُ أَنْ يُزَوِّجَ الرَّجُلُ الرَّجُلَ ابْنَتَهُ عَلَى أَنْ يُزَوِّجَهُ ابْنَتَهُ وَلَيْسَ بَيْنَهُمَا صَدَاقٌ .
Harun ibn Abd Allah reported to us; he said: Ma'n narrated to us; he said: Malik narrated to us, from Nafi. And al-Harith ibn Miskin, by recitation to him while I listened, from Ibn al-Qasim, said: Malik narrated to me, from Nafi, from Ibn Umar, that the Messenger of Allah (peace and blessings of Allah be upon him) prohibited shighar. Shighar is when a man gives his daughter in marriage to another man on the condition that the other gives his daughter in marriage to him, with no bridal dower between them.
Translation notes
The report defines shighar as reciprocal marriage of daughters conditioned on one another, with no dower between the two parties.