The Messenger of Allah ﷺ said, "The month is like this, and this, and this," meaning twenty-nine.
حدثنا الطالقاني حدثنا ابن المبارك عن إسماعيل
قال رسول الله ﷺ الشهر هكذا وهكذا وهكذا يعني تسعا وعشرين
Its isnad is sahih. Talaqani is Ibrahim bin Ishaq bin Isa, Abu Ishaq, and he is trustworthy and firmly reliable. Talaqan, with a fatha on the lam, is the name of a town. This hadith is a repetition of the one before it.