Abu Dawud Book 6, Hadith Number 2202.
Chapter : Not known.
Narated By Rukanah ibn Abdu Yazid : (Rukanah) divorced his wife absolutely; so he came to the Apostle of Allah (PBUH). He asked (him): What did you intend? He said: A single utterance of divorce. He said: Do you swear by Allah? He replied: I swear by Allah. He said: It stands as you intended.