Musannaf Ibn Abi Shaybah 19142 — A man divorcing his wife irrevocably

Abu Bakr (may Allah have mercy on him) said: Umar bin Abd al-Aziz (may Allah have mercy on him) asked me about the irrevocable divorce (al-battah), and I said to him: "Aban bin Uthman used to say that it is one divorce." Umar (may Allah have mercy on him) said: "Even if divorces were a thousand, giving an irrevocable divorce would not leave a single divorce remaining."