Musannaf Ibn Abi Shayba 9:1518

Ghundar narrated to us, from Shu'bah, from al-Hakam, who said: 'Abd al-Rahman ibn Umm al-Hakam wanted to buy her share from the daughter of Jarir while he was ill, but she refused. So he married three [women] over her while he was ill, and it was permitted.