Volume 8, Book 78, Number 675:
Narrated Anas:
Allah’s Apostle took an oath for abstention from h is wives (for one month), and during those days
he had a sprain in his foot. He stayed in a Mashrubah (an upper room) for twenty-nine nights and
then came down. Then the people said, “O Allah’s Apostle! You took an oath for abstention (from
your wives) for one month.” On that he said, A month can be of twenty-nine days ‘