Muwatta Malik #173
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ إِذَا صَلَّى وَحْدَهُ يَقْرَأُ فِي الأَرْبَعِ جَمِيعًا فِي كُلِّ رَكْعَةٍ بِأُمِّ الْقُرْآنِ وَسُورَةٍ مِنَ الْقُرْآنِ وَكَانَ يَقْرَأُ أَحْيَانًا بِالسُّورَتَيْنِ وَالثَّلاَثِ فِي الرَّكْعَةِ الْوَاحِدَةِ مِنْ صَلاَةِ الْفَرِيضَةِ وَيَقْرَأُ فِي الرَّكْعَتَيْنِ مِنَ الْمَغْرِبِ كَذَلِكَ بِأُمِّ الْقُرْآنِ وَسُورَةٍ سُورَةٍ .
Yahya related to me from Malik from Nafi that Abdullah ibn Umar
used to recite in all four rakas as when he prayed alone - in every
raka the umm al-Qur'an and another sura from the Qur'an. Sometimes he
would recite two or three suras in one raka in the obligatory prayer.
Similarly, he recited the umm al-Qur'an and two suras in the first two
rakas of maghrib.
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About Muwatta Malik
This hadith is #173 from Muwatta Malik, in the Book of Prayer.