Muhammad bin Amr bin Sa'id (may Allah have mercy on him) says that the sons of Sa'id bin al-As had a slave, and all of them freed him except one man. The slave sought the intercession of the Prophet (peace and blessings be upon him) with that man, so he gifted his share to the Prophet (peace and blessings be upon him), and he (peace and blessings be upon him) set him free. The slave used to say: I am the freed slave of the Messenger of Allah (peace and blessings be upon him). The man was called Rafi' Abu al-Bahi.
This hadith is munqati' (its chain is broken).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب العتق / 21351