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