The Messenger of Allah ﷺ said, "The month is twenty-nine days."
أخبرنا محمد بن المثنى قال حدثنا محمد قال حدثنا شعبة عن عقبة يعني ابن حريث قال سمعت
قال رسول الله ﷺ الشهر تسع وعشرون
No references are available.
Reported by Muslim, no. 14/1080, from Muhammad bin Muthanna through the same chain (see the preceding hadith). It is also found in Al-Kubra, no. 2453.