Allah's Messenger (ﷺ) took an oath that he would not visit his wives for one month, and he sat in an upper room belonging to him. Then, on the twenty ninth day he came down. It was said, "O Allah's Messenger (ﷺ)! You had taken an oath not to visit your wives for one month." He said, "The (present) month is of twenty-nine days."
Sahih al-Bukhari Book 67, Hadith 135
← Previous Hadith The Prophet (ﷺ) said, "All of you are guardians and are responsible for your wards. The ruler is a guardian and the man is a guardian of his family; the lady is a guardian and is responsible for her husband's house and his offspring; and so all of you are guardians and are responsible for your wards."

Sahih al-Bukhari Book 67, Hadith 134 Next Hadith → The Prophet (ﷺ) took an oath that he would not enter upon some of his wives for one month. But when twenty nine days had elapsed, he went to them in the morning or evening. It was said to him, "O Allah's Prophet! You had taken an oath that you would not enter upon them for one month." He replied, "The month can be of twenty nine days."

Sahih al-Bukhari Book 67, Hadith 136