Jabir bin Abdullah reported,

The Messenger of Allah ﷺ withdrew from his wives for a month. He came out to us on the twenty-ninth day, and we said, "It has only been twenty-nine days." He clapped his hands together three times, holding back one finger on the last clap.

Azami 4335

Sahih

عن جابر بن عبد الله، قال

كان رسول الله ﷺ اعتزل نساءه شهرا، فخرج إلينا في تسع وعشرين، فقلنا: إنما الشهر، وصفق بيديه ثلاث مرات، وحبس إصبعا واحدة في الآخرة.

الأعظمي 4335صحيح
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 4335 (2nd edition)
Azami 4335