Musannaf Ibn Abi Shayba 26:298

Waki' narrated to us, he said: Ibn Abi Layla narrated to us, from al-Sha'bi, from Ali and Abdullah, that they both said regarding the son of the woman involved in *li'an* (imprecation): His *'asaba* (agnatic heirs) are the *'asaba* of his mother.