Musannaf Ibn Abi Shayba 18:1259

Abu Bakr narrated to us, he said: Abbad ibn al-Awwam narrated to us, from Umar, from Hammad, from Ibrahim, who said: His entire inheritance is for his mother, and her agnates (asaba) pay his blood money (diya). Likewise is the child of adultery, and the child of a Christian woman whose mother is a Muslim.