Muwatta Malik, Book 3, Hadith 190 (In-Book) ⓘ
Yahya related to me from Malik from Yahya ibn Said and from Rabia ibn Abi Abd ar Rahman that al-Qasim ibn Muhammad used to recite behind the imam when the imam did not recite aloud.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، وَعَنْ رَبِيعَةَ بْنِ أَبِي عَبْدِ الرَّحْمَنِ، أَنَّ الْقَاسِمَ بْنَ مُحَمَّدٍ، كَانَ يَقْرَأُ خَلْفَ الإِمَامِ فِيمَا لاَ يَجْهَرُ فِيهِ الإِمَامُ بِالْقِرَاءَةِ .
also referenced under: Book 3, Hadith 43 (USC-MSA)