It is narrated from Sayyiduna Imran bin Husayn (may Allah be pleased with him) that a man freed his six slaves at the time of his death, "so the Prophet (peace and blessings be upon him) cast lots between them, freed two, and kept four in slavery."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15456
It is narrated from Sayyiduna Imran bin Husayn (may Allah be pleased with him) that the Prophet of Allah (peace and blessings be upon him) said: "There is no shighar (exchange marriage without dower) in Islam."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15457