Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) says that the Messenger of Allah (peace and blessings be upon him) said: "Whoever frees his share of a slave shall be obliged to free the rest of the slave."
Yahya (may Allah have mercy on him) said: I do not know whether he said this from himself or whether it is in the hadith: if he does not have the price, then what he has done is sufficient.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب العتق / 21345
Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) says that the Messenger of Allah (peace and blessings be upon him) said: "Any man who has a share in a slave and frees his share, it is his duty to free the remainder as well at a fair value."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب العتق / 21346
Ibn Umar (may Allah be pleased with them both) says that the Messenger of Allah (peace and blessings be upon him) said: "Whoever frees a share of a slave, it becomes binding on him to free the rest of the slave as well. If he has that much of the price with him, a fair value shall be fixed, the other partners shall be given their shares, and the freed slave's way shall be left free."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب العتق / 21347
Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) says that the Messenger of Allah (peace and blessings be upon him) said: "Whoever frees his share in a slave, it is his duty to have the remaining shares freed as well."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب العتق / 21348
Ibn Abbas (may Allah be pleased with them both) narrates from the Prophet (peace and blessings be upon him): "Whoever frees his share in a slave is liable for his freedom: the slave's value shall be assessed and he shall be set free."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب العتق / 21349
Abd al-Rahman bin Yazid (may Allah have mercy on him) says: A slave was jointly owned by me, al-Aswad and our mother. He had taken part in the Battle of al-Qadisiyyah and fought valiantly there. They intended to free him, and I was young. Al-Aswad mentioned this to Sayyiduna Umar (may Allah be pleased with him), and Sayyiduna Umar (may Allah be pleased with him) said: You free him, and Abd al-Rahman will remain on his share until he comes to desire the same as you have desired, or he will take his share.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب العتق / 21350
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