The grandson of Sayyiduna Rukanah (may Allah be pleased with him) narrates through his father that Rukanah (may Allah be pleased with him) divorced his wife with 'al-battah' (an irrevocable divorce). He came to the Messenger of Allah (peace and blessings be upon him), and he (peace and blessings be upon him) questioned him and said: "What did you intend?" He said: One divorce. He (peace and blessings be upon him) said: "By Allah?" He said: By Allah. He (peace and blessings be upon him) said: "It is what you intended."
Hadith Referenceالمعجم الكبير للطبراني / باب الراء / 4597