It was narrated that:
Ibn Umar said: "The Messenger of Allah forbade Shighar. Shighar is when a man says to another man: 'Marry your daughter or sister to me, on condition that I will marry my daughter or sister to you,' and they do not give any dower (i.e. neither of them give other the dower)."
English reference: Vol. 3, Book 9, Hadith 1883
Arabic reference: Book 9, Hadith 1957