Musannaf Ibn Abi Shayba 13:2861

Abu Bakr narrated to us, he said: Abd al-Wahhab ibn 'Ata' narrated to us, from Ibn Abi 'Aruba, from Dawud ibn Abi al-Qassaf, from Riyah ibn 'Ubaydah, that Umar ibn Abd al-Aziz wrote to him to sell some of the slaves of the emirate. And [he instructed him] to sell the members of the household together, and not to separate between them.