Mishkat al-Masabih #1365
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ سَعِيدِ بْنِ الْعَاصِ قَالَ: سَأَلْتُ أَبَا مُوسَى وَحُذَيْفَةَ: كَيْفَ كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يُكَبِّرُ فِي الْأَضْحَى وَالْفِطْرِ؟ فَقَالَ أَبُو مُوسَى: كَانَ يُكَبِّرُ أَرْبَعًا تَكْبِيرَهُ على الجنازه. فَقَالَ حُذَيْفَة: صدق. رَوَاهُ أَبُو دَاوُد
Sa'id b. al-‘As said he asked Abu Musa and Hudhaifa how God’s Messenger said “God is most great” on the day of sacrifice and of the breaking of the fast. Abu Musa said he uttered it four times as he did at funerals and Hudhaifa said that that was correct.
Abu Dawud transmitted it.
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About Mishkat al-Masabih
This hadith is #1365 from Mishkat al-Masabih, in the Book of Prayer.