Ibn ‘Umar said “The Apostle of Allaah(ﷺ) prohibited shighar marriage. Musaddad added in his version “I said to ‘Nafi “What is shighar?” (It means that) a man marries the daughter of another man and gives his own daughter to him in marriage without fixing dower; and a man marries the sister of another man and gives him his sister in marriage without fixing dower

English translation · Sunan Abu Dawud