Abdullah bin Abbas reported,

The Prophet ﷺ said, "Jibreel عليه السلام came to me and said, 'The month is twenty-nine days.'"

Azami 4331

Sahih

عن ابن عباس

عن النبي ﷺ قال: أتاني جبريل عليه السلام، فقال: الشهر تسع وعشرون يوما.

الأعظمي 4331صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Fasting
Chapter
Obligation of fasting, its virtue, and its rulings
Section
Month can be twenty-nine days
Numbering
Jami al-Kamil 4331 (2nd edition)
Azami 4331