Musannaf Ibn Abi Shaybah

It is narrated from A‘mash that Ibn Abbas (may Allah be pleased with them both) sent a man to Zaid to inquire about the issue of the husband and the parents, so he said: The husband gets half of the wealth and the mother gets one third of the remaining wealth. Ibn Abbas (may Allah be pleased with them both) asked: Do you find in the Book of Allah that the mother gets one third of the remainder? Zaid replied: This is my opinion; Allah Almighty knows best. Abu Bakr says: These are six shares: three shares for the husband, one share for the mother, and two shares for the father.