"When the Prophet commanded the two who were engaging in Li'an to utter the fifth oath, he commanded a man to place his hand over his mouth, and he said: "It will inevitably bring the punishment upon the liar."
Reference: Sunan an-Nasa'i 3472 In-book : Book 27, Hadith 84 English translation : Vol. 4, Book 27, Hadith 3502
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