Mukhtasar Bukhari (Abridged) 1843 — on Shighar Marriage

Narrated Ibn Umar (may Allah be pleased with them) that the Messenger of Allah (peace and blessings of Allah be upon him) forbade Shighar marriage (which means that a man gives his daughter or sister in marriage to another man on the condition that the latter gives his daughter or sister in marriage to the former, and no dowry is fixed for either of them).