"The Messenger of Allah forbade Ash-Shighar." (One of the narrators) 'Ubaidullah said: "Ash-Shighar means when a man gives his daughter in marriage on condition that (the other man) gives him his sister in marriage."
Reference: Sunan an-Nasa'i 3338 In-book : Book 26, Hadith 143 English translation : Vol. 4, Book 26, Hadith 3340
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