Sahih Muslim Book 8, Hadith Number 3299.
Chapter: It is prohibited to contract shighar marriage.
Abu Huraira (Allah be pleased with him) reported that Allah’s Messenger (May peace be upon him) prohibited Shighar. Ibn Numair added: Shighar means that a person should say to the other person: Give me the hand of your daughter in marriage and I will (in return) marry my daughter to you; or merry me your sister, and I will marry my sister to you.