He said...

He said, ‘Take his son who sold to you the mother of the child until he pays you for the sale.’ When he took him his father said, ‘Allow my son to go.’ He said, ‘No, by Allah, I will not allow him to go until you allow my son to go.’ When the master of the mother of the child saw this he authorized the sale of his son.’”

حسن - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (19/237))