Bulugh al-Maram #762
Fasting
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنِ اِبْنِ عُمَرَ رَضِيَ اَللَّهُ عَنْهُمَا قَالَ: { تَرَاءَى اَلنَّاسُ اَلْهِلَالَ, فَأَخْبَرْتُ رَسُولَ اَللَّهِ - صلى الله عليه وسلم -أَنِّي رَأَيْتُهُ, فَصَامَ, وَأَمَرَ اَلنَّاسَ بِصِيَامِهِ } رَوَاهُ أَبُو دَاوُدَ, وَصَحَّحَهُ اِبْنُ حِبَّانَ, وَالْحَاكِمُ 1 .1 - صحيح. رواه أبو داود ( 2342 )، وابن حبان ( 3438 )، والحاكم ( 1 / 423 ).
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.