the Messenger of Allah (ﷺ) swore to keep away from his wives, because Zainab had sent back her gift and 'Aishah said: "She has disgraced you." He became angry and swore to keep away from them.
Sunan Ibn Majah Book 10, Hadith 45
← Previous Hadith "The Messenger of Allah (ﷺ) swore that he would not enter upon his wives for a month, and he stayed for twenty-nine days until, on the eve of the thirtieth, he entered upon me. I said: 'You swore not to enter upon us for a month.' He said: 'The month may be like this,' and he held up his (ten) fingers three times; 'or the month may be like this,' and he held up his fingers three times, keeping one finger down on the third time."

Sunan Ibn Majah Book 10, Hadith 44 Next Hadith → the Messenger of Allah (ﷺ) swore to keep away from some of his wives for a month. On the twenty-ninth day, in the evening or the morning, it was said: "O Messenger of Allah, only twenty-nine days have passed." He said: "The month is twenty-nine days."

Sunan Ibn Majah Book 10, Hadith 46