"(The months in which) We fasted twenty-nine days at the time of the Messenger of Allah (ﷺ), were more than (the months in which) we fasted thirty days.
Sunan Ibn Majah Book 7, Hadith 21
← Previous Hadith “The Messenger of Allah (ﷺ) said: ‘The month is like that and like that and like that,’ and he showed nine fingers on the third time to indicate twenty-nine.”

Sunan Ibn Majah Book 7, Hadith 20 Next Hadith → “Two months of ‘Eid whose reward cannot be reduced (even if they are twenty-nine days): ‘Ramadan and Dhul-Hijjah.”

Sunan Ibn Majah Book 7, Hadith 22