"The Prophet swore an oath of abstention from his wives for a month and stayed in his room for twenty-nine days. It was said: 'O Messenger of Allah, did you not swear an oath of abstention for a month?' He said: 'This month is twenty-nine days.'"
Reference: Sunan an-Nasa'i 3456 In-book : Book 27, Hadith 68 English translation : Vol. 4, Book 27, Hadith 3486
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