Musannaf Ibn Abi Shaybah 34957 — What they said on an apostate

Ash'ath (may Allah have mercy on him) says that Amir (may Allah have mercy on him) and al-Hakam (may Allah have mercy on him), both of them, said about a Muslim who apostatizes from Islam and goes off to the land of the enemy; they both said: "If his wife menstruates, she will observe a waiting period of three menstrual cycles. If she does not menstruate, she will observe a waiting period of three months. And if she is pregnant, the delivery of her child is her waiting period. Then the inheritance of that apostate will be divided between his wife and his Muslim heirs. Then, if that woman wishes, she may marry. And if the apostate returns and repents before his wife's waiting period is complete, the two of them will remain on their former marriage."