مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1884
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Ibn ‘Abbas that Jibreel (عليه السلام) came to the Prophet (ﷺ) and said: “The month is complete with twenty nine days.”
Musnad Ahmad 1885Sahih (Darussalam) [.]