Mishkat al-Masabih #972
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَن ابْنِ عُمَرَ أَنَّهُ قَالَ: إِنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَرَأَ عَامَ الْفَتْحِ سَجْدَةً فَسَجَدَ النَّاسُ كُلُّهُمْ مِنْهُمُ الرَّاكِبُ وَالسَّاجِدُ عَلَى الْأَرْضِ حَتَّى إِنَّ الرَّاكِبَ لَيَسْجُدُ عَلَى يَده. رَوَاهُ أَبُو دَاوُد
He said that in the year of the Conquest* God's Messenger recited a verse at which a prostration should be made and all the people prostrated themselves. Some were mounted, some were prostrating themselves on the ground, and those who were mounted prostrated themselves on their hands.
* i.e. the Conquest of Mecca in 8 A.H.
Abu Dawud transmitted it.
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About Mishkat al-Masabih
This hadith is #972 from Mishkat al-Masabih, in the Book of Prayer.