Abdullah bin Abbas reported,

An Arabi came to the Prophet ﷺ and said, "I have sighted the crescent," meaning the crescent of Ramadan.The Prophet ﷺ asked, "Do you bear witness that there is no god but Allah?"He replied, "Yes."The Prophet ﷺ asked, "Do you bear witness that Muhammad is the Messenger of Allah?"He replied, "Yes."The Prophet ﷺ said, "Bilal, announce to the people that they are to fast tomorrow."

Azami 4344

Hasan

عن ابن عباس، قال

جاء أعرابي إلى النبي ﷺ فقال: إني رأيت الهلال- يعني هلال رمضان- فقال: أتشهد أن لا إله إلا الله؟ قال: نعم، قال: أتشهد أن محمدا رسول الله؟ قال: نعم. قال: يا بلال، أذن في الناس أن يصوموا غدا.

الأعظمي 4344حسن
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Fasting
Chapter
Obligation of fasting, its virtue, and its rulings
Section
Testimony of one person regarding the sighting of the Hilal of Ramadan
Numbering
Jami al-Kamil 4344 (2nd edition)
Azami 4344