Abdullah bin Umar reported,

The Prophet ﷺ said, "The month is like this, like this, and like this," meaning ten, ten, and nine.

Muslim 2508

Sahih

و حدثنا سهل بن عثمان حدثنا زياد بن عبد الله البكائي عن عبد الملك بن عمير عن موسى بن طلحة

عن عبد الله بن عمر رضي الله عنهما

عن النبي ﷺ قال الشهر هكذا وهكذا وهكذا عشرا وعشرا وتسعا

مسلم 2508صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Muslim
Book
Fasting
Chapter
Obligation of fasting Ramadan upon sighting Hilal and breaking the fast upon sighting Hilal, and that if it is obscured at its beginning or end the month is completed as thirty days
Numbering
Darussalam 2508
Muslim 2508