Mishkat al-Masabih #810
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ عَبْدُ اللَّهِ بْنِ عَامِرِ بْنِ رَبِيعَةَ قَالَ: صلينَا وَرَاء عمر ابْن الْخطاب الصُّبْح فَقَرَأَ فيهمَا بِسُورَةِ يُوسُفَ وَسُورَةِ الْحَجِّ قِرَاءَةً بَطِيئَةً قِيلَ لَهُ: إِذًا لَقَدْ كَانَ يَقُومُ حِينَ يَطْلُعُ الْفجْر قَالَ: أجل. رَوَاهُ مَالك
‘Amir b. Rabi'a said that they prayed the morning prayer behind ‘Umar b. al-Khattab and that he recited slowly in both rak'as Sura Yusuf and Sura al-Hajj (Al-Qur’an; 22). When someone remarked that he must have begun the prayer at break of day he replied that that was so.
Malik transmitted it.
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About Mishkat al-Masabih
This hadith is #810 from Mishkat al-Masabih, in the Book of Prayer.