Sayyiduna Abu Hurayrah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) forbade shighar, and Ibn Numayr added: "Shighar is that a man says to another man: Marry your daughter to me and I will marry my daughter to you; and marry your sister to me and I will marry my sister to you."
(b) Abdah narrates from Ubaydullah: "and there is no dowry between them."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 14136