Musannaf Ibn Abi Shayba 36:213

Waki’ narrated to us, from Sufyan, from Sa’d ibn Ibrahim, from ‘Abdullah ibn Shaddad, from ‘Ali ibn Abi Talib, who said: I did not hear the Messenger of Allah, may Allah bless him and grant him peace, ransom anyone with his parents except for Sa’d. For I heard him say on the day of Uhud: "Shoot, Sa’d! May my father and mother be ransomed for you."