(4) باب فِي طَلاَقِ السُّنَّةِ
Yunus bin Jubair said that he asked Ibn 'Umar "How many times did you pronounce divorce to your wife? He replied, once."
Reference: Sunan Abi Dawud 2183
In-book reference: Book 13, Hadith 9
English translation: Book 12, Hadith 2178