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.
Sunan an-Nasa'i Book 26, Hadith 142
← Previous Hadith "The Messenger of Allah said: 'There is no 'bringing', no 'avoidance' and no Shighar in Islam, and whoever robs, he is not one of us.'"

Sunan an-Nasa'i Book 26, Hadith 141 Next Hadith → "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."

Sunan an-Nasa'i Book 26, Hadith 143