Yahya related to me from Malik from Nafi that Abdullah ibn Umar, when asked if anyone should recite behind an imam, said, "When you pray behind an imam then the recitation of the imam is enough for you and when you pray on your own you must recite." Nafi added, "Abdullah ibn 'Umar used not to recite behind the imam." Yahya said that he heard Malik say, "The position with us is that aman recites behind the imam when the imam does not recite aloud and he refrains from reciting when the imam recites aloud."  

أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ كَانَ إِذَا سُئِلَ هَلْ يَقْرَأُ أَحَدٌ خَلْفَ الإِمَامِ قَالَ إِذَا صَلَّى أَحَدُكُمْ خَلْفَ الإِمَامِ فَحَسْبُهُ قِرَاءَةُ الإِمَامِ وَإِذَا صَلَّى وَحْدَهُ فَلْيَقْرَأْ قَالَ وَكَانَ عَبْدُ اللَّهِ بْنُ عُمَرَ لاَ يَقْرَأُ خَلْفَ الإِمَامِ قَالَ يَحْيَى سَمِعْتُ مَالِكًا يَقُولُ الأَمْرُ عِنْدَنَا أَنْ يَقْرَأَ الرَّجُلُ وَرَاءَ الإِمَامِ فِيمَا لاَ يَجْهَرُ فِيهِ الإِمَامُ بِالْقِرَاءَةِ وَيَتْرُكُ الْقِرَاءَةَ فِيمَا يَجْهَرُ فِيهِ الإِمَامُ بِالْقِرَاءَةِ  

Yahya related to me from Malik from Ibn Shihab from Ibn Ukayma al-Laythi from Abu Hurayra that the Messenger of Allah ﷺ finished a prayer in which he had recited aloud and asked, "Did any of you recite with me just now?" One man said, "Yes, I did, Messenger of Allah." The Messenger of Allah ﷺ said, "I was saying to myself, 'Why am I distracted from the Qur'an?' " When the people heard the Messenger of Allah ﷺ say that, they refrained from reciting with the Messenger of Allah ﷺ when he recited aloud.  

أَنَّ رَسُولَ اللَّهِ ﷺ انْصَرَفَ مِنْ صَلاَةٍ جَهَرَ فِيهَا بِالْقِرَاءَةِ فَقَالَ هَلْ قَرَأَ مَعِي مِنْكُمْ أَحَدٌ آنِفًا فَقَالَ رَجُلٌ نَعَمْ أَنَا يَا رَسُولَ اللَّهِ قَالَ فَقَالَ رَسُولُ اللَّهِ ﷺ إِنِّي أَقُولُ مَا لِي أُنَازَعُ الْقُرْآنَ فَانْتَهَى النَّاسُ عَنِ الْقِرَاءَةِ مَعَ رَسُولِ اللَّهِ ﷺ فِيمَا جَهَرَ فِيهِ رَسُولُ اللَّهِ ﷺ بِالْقِرَاءَةِ حِينَ سَمِعُوا ذَلِكَ مِنْ رَسُولِ اللَّهِ ﷺ