Hadith - Nikah Shigar is Not Allowed in Islam
Ibn Umar (Allah be pleased with them) said that Allah's Messenger (may peace be upon him) prohibited Shighar which means that a man gives his daughter in marriage on the condition that the other gives his daughter to him in marriage with- out any dower being paid by either.
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.
Sahi Muslim, The Book Marriage