Isma'il bin Umayyah narrates from his father, and he from his grandfather, that they had a slave named Tahman or Dhakwan. Their grandfather set half of him free. The slave came and informed the Prophet (peace and blessings be upon him), and he (peace and blessings be upon him) said: "You are free to the extent that you have been freed, and the remaining part is enslaved." He continued to serve his master until he died.
Only Umar bin Hawshab narrated it. Isma'il is Ibn Umayyah bin Amr bin Sa'id bin al-As, and Amr bin Sa'id was not a Companion.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب العتق / 21319