Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
bayhaqi:2480[Chain 1] Abū Zakariyyā b. Abū Isḥāq > Abū al-ʿAbbās > al-Rabīʿ > al-Shāfiʿī > Mālik [Chain 2] Abū Aḥmad al-Mihrajānī > Abū Bakr b. Jaʿfar > Muḥammad b. Ibrāhīm > Ibn Bukayr > Mālik > Nāfiʿ

[Machine] Abdullah bin Umar used to recite in all four units of prayer, in each unit, Surah Al-Fatiha and another Surah. Sometimes he would recite two or three Surahs in a single unit of the obligatory prayer. He would also recite Surah Al-Fatiha and another Surah in the two units of the Maghrib prayer. These details are mentioned in the narration of Ibn Bukair, and Al-Shafi'i did not mention anything specifically about the Maghrib prayer.  

البيهقي:٢٤٨٠وَأَخْبَرَنَا أَبُو زَكَرِيَّا بْنُ أَبِي إِسْحَاقَ ثنا أَبُو الْعَبَّاسِ أنبأ الرَّبِيعُ أنبأ الشَّافِعِيُّ أنبأ مَالِكٌ ح وَأَخْبَرَنَا أَبُو أَحْمَدَ الْمِهْرَجَانِيُّ أنبأ أَبُو بَكْرِ بْنُ جَعْفَرٍ ثنا مُحَمَّدُ بْنُ إِبْرَاهِيمَ ثنا ابْنُ بُكَيْرٍ ثنا مَالِكٌ عَنْ نَافِعٍ

أَنَّ عَبْدَ اللهِ بْنَ عُمَرَ كَانَ إِذَا صَلَّى وَحْدَهُ يَقْرَأُ فِي الْأَرْبَعِ جَمِيعًا فِي كُلِّ رَكْعَةٍ بِأُمِّ الْقُرْآنِ وَسُورَةٍ وَكَانَ أَحْيَانًا يَقْرَأُ بِالسُّورَتَيْنِ وَالثَّلَاثِ فِي الرَّكْعَةِ الْوَاحِدَةِ فِي صَلَاةِ الْفَرِيضَةِ وَيَقْرَأُ فِي الرَّكْعَتَيْنِ مِنَ الْمَغْرِبِ كَذَلِكَ بِأُمِّ الْقُرْآنِ وَسُورَةٍ سُورَةٍ لَفْظُ حَدِيثِ ابْنِ بُكَيْرٍ وَلَمْ يَذْكُرِ الشَّافِعِيُّ الْمَغْرِبَ  


See similar narrations below:

Collected by Mālik
malik:3-27Mālik > Nāfiʿ

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.  

مالك:٣-٢٧وَحَدَّثَنِي 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