"The Messenger of Allah vowed to stay away from his wives for a month, so he stayed in a loft for twenty-nine days. They said: 'O Messenger of Allah, your vow was for a month,' so he said: 'The month is twenty-nine (days).'"
Reference: Jami` at-Tirmidhi 690 In-book : Book 8, Hadith 9 English translation : Vol. 2, Book 3, Hadith 690
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