Jibreel came to the Prophet ﷺ and said, "The month is complete at twenty-nine days."
حدثنا عمرو بن الهيثم حدثنا شعبة عن سلمة بن كهيل عن أبي الحكم
أن جبريل عليه السلام أتى النبي ﷺ فقال تم الشهر تسعا وعشرين
No references are available.
Its isnad is sahih. Abu Hakam is Imran bin Harith Sulami, previously mentioned in 185. Nasai narrated the hadith 1:302 through Shubah. See also 1594-1596. It will come at greater length in 2103.