Bulugh al-Maram #762
Fasting
Ibn ’Umar (RAA) narrated, ‘The people were trying to sight the new moon (of Ramadan.) and when I reported to the Messenger of Allah (ﷺ) that I had seen it, he fasted and commanded people to fast.’ Related by Abu Dawud, and Al-Hakim and Ibn Hibban graded it as Sahih.
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About Bulugh al-Maram
This hadith is #762 from Bulugh al-Maram, in the Book of Fasting. Bulugh al-Maram contains 1,767 hadiths across 16 books.