Yahya related to me from Malik from Abd ar-Rahman ibn al-Qasimthat al-Qasim ibn Muhammad had done the same as Ibn Umar. (PT)
App reference (PT): Book 7, Hadith 33 (PT)
USC-MSA web (English) reference: Book 7, Hadith 33 (PT)
Arabic reference (PT): Book 7, Hadith 287 (PT)