Ibn Umar (Allah be pleased with them) said that Messenger of Allah ﷺ prohibited Shighar which means that a man gives his daughter in marriage on the condition that the other gives his daughter to him in marriage with- out any dower being paid by either.  

أَنَّ رَسُولَ اللَّهِ ﷺ نَهَى عَنِ الشِّغَارِ وَالشِّغَارُ أَنْ يُزَوِّجَ الرَّجُلُ ابْنَتَهُ عَلَى أَنْ يُزَوِّجَهُ ابْنَتَهُ وَلَيْسَ بَيْنَهُمَا صَدَاقٌ  

It was narrated from Ibn 'Umar that the Messenger of Allah forbade Ash-Shighar. Ash-Shighar means when a man marries his daughter to another man, on the condition that that man marries his daughter to him, and no dowry is exchanged between them.  

أَنَّ رَسُولَ اللَّهِ ﷺ نَهَى عَنِ الشِّغَارِ وَالشِّغَارُ أَنْ يُزَوِّجَ الرَّجُلُ الرَّجُلَ ابْنَتَهُ عَلَى أَنْ يُزَوِّجَهُ ابْنَتَهُ وَلَيْسَ بَيْنَهُمَا صَدَاقٌ  

Yahya related to me from Malik from Nafi from Abdullah ibn Umar that the Messenger of Allah ﷺ forbade shighar, which meant one man giving his daughter in marriage to another man on the condition that the other gave his daughter to him in marriage without either of them paying the bride-price.  

أَنَّ رَسُولَ اللَّهِ ﷺ نَهَى عَنِ الشِّغَارِ وَالشِّغَارُ أَنْ يُزَوِّجَ الرَّجُلُ ابْنَتَهُ عَلَى أَنْ يُزَوِّجَهُ الآخَرُ ابْنَتَهُ لَيْسَ بَيْنَهُمَا صَدَاقٌ  

[Machine] "The Messenger of Allah ﷺ prohibited 'shighar'. Malik said, 'Shighar' is when a man gives his daughter in marriage to another man, while that man gives his daughter in marriage to the first man, without any dowry. Abu Muhammad was asked, 'Do you consider marriage between them valid?' He said, 'I do not approve of it.'"  

«نَهَى رَسُولُ اللَّهِ ﷺ عَنِ الشِّغَارِ» قَالَ مَالِكٌ وَالشِّغَارُ أَنْ يُزَوِّجَ الرَّجُلُ الْآخَرَ ابْنَتَهُ عَلَى أَنْ يُزَوِّجَهُ الْآخَرُ ابْنَتَهُ بِغَيْرِ صَدَاقٍ قِيلَ لِأَبِي مُحَمَّدٍ تَرَى بَيْنَهُمَا نِكَاحًا قَالَ لَا يُعْجِبُنِي  

Messenger of Allah ﷺ forbade Ash-Shighar, which means that somebody marries his daughter to somebody else, and the latter marries his daughter to the former without paying Mahr. (Using translation from Bukhārī 5112)  

أَنَّ رَسُولَ اللهِ ﷺ «نَهَى عَنِ الشِّغَارِ وَالشِّغَارُ أَنْ يُزَوِّجَ الرَّجُلُ الرَّجُلَ ابْنَتَهُ عَلَى أَنْ يُزَوِّجَهُ ابْنَتَهُ وَلَيْسَ بَيْنَهُمَا صَدَاقٌ»  

[Machine] The Messenger of Allah ﷺ forbade "shighar", and "shighar" is when a man marries off his daughter on the condition that the other man will marry off his daughter in return, but there is no dowry between them. Yahya did not mention the other man.  

رَسُولَ اللهِ ﷺ نَهَى عَنِ الشِّغَارِ وَالشِّغَارُ أَنْ يُزَوِّجَ الرَّجُلُ ابْنَتَهُ عَلَى أَنْ يُزَوِّجَهُ الرَّجُلُ الْآخَرُ ابْنَتَهُ وَلَيْسَ بَيْنَهُمَا صَدَاقٌ وَلَمْ يَذْكُرْ يَحْيَى الرَّجُلَ الْآخَرَ