Musannaf Ibn Abi Shaybah 20184 — A man with several wives who divorces

Makhul (may Allah have mercy on him) said: If a man has four wives, divorces one of them, marries a fifth, and then dies, and it is not known whom he divorced, in this case a quarter of the eighth will go to the woman he married last, and three-quarters will go to the other four women.