(27) باب فِي اللِّعَانِ
Narrated Abdullah ibn Abbas:
When the Prophet (ﷺ) ordered a man and his wife to invoke curses on each other, he ordered a man to put his hand on his mouth when he came to the fifth utterance, saying that it would be the deciding one.
Reference: Sunan Abi Dawud 2255
In-book reference: Book 13, Hadith 81
English translation: Book 12, Hadith 2247