مَالِكٌ، عَنْ يَحْيَى بْنِ سَعِيدٍ، وَعَنْ رَبِيعَةَ بْنِ أَبِي عَبْدِ الرَّحْمَنِ، أَنَّ الْقَاسِمَ بْنَ مُحَمَّدٍ كَانَ يَقْرَأُ خَلْفَ الْإِمَامِ فِيمَا لَا يَجْهَرُ فِيهِ الْإِمَامُ بِالْقِرَاءَةِ
It is narrated from Rabi'ah bin Abi Abdur Rahman, may Allah have mercy on him, that indeed Qasim bin Muhammad bin Abi Bakr as-Siddiq used to recite (Qur'an) behind the Imam in those prayers in which the Imam does not recite aloud.