Yahya related to me from Malik from Yahya ibn Said and from Rabiaibn Abi Abd ar Rahman that al-Qasim ibn Muhammad used to recite behindthe imam when the imam did not recite aloud.
App reference: Book 3, Hadith 43
USC-MSA web (English) reference: Book 3, Hadith 43
Arabic reference: Book 3, Hadith 190