Bakr bin Abdullah al-Muzani (may Allah have mercy on him) said that the wealth of a freed slave of Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) was brought to him. He said: We freed him as a sa'ibah. Then he ordered that slaves be bought with it and set free.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الولاء / 21485