Abdullah bin Umar reported,

The Messenger of Allah ﷺ said, "The month is twenty-nine days." Shuba clapped his hands together three times, folding down his thumb on the third clap.Uqba said, "I believe he also said, 'And the month is thirty days,'" and he clapped his hands together three times.

Ahmad 5484

Sahih

حدثنا محمد بن جعفر حدثنا شعبة عن عقبة بن حريث سمعت

ابن عمر يقول

قال رسول الله ﷺ الشهر تسع وعشرون وطبق شعبة يديه ثلاث مرات وكسر الإبهام في الثالثة قال عقبة وأحسبه قال والشهر ثلاثون وطبق كفيه ثلاث مرات

أحمد 5484صحيح
Contents
Reference
Commentary
Ayat
Collection
Musnad Ahmad
Book
Abdullah bin Umar
Numbering
Darussalam 5484
Ahmad 5484