Sayyiduna Ibn Mas'ud (may Allah be pleased with him) says that I have recited seventy surahs after hearing them from the blessed mouth of the Prophet (peace and blessings be upon him), and Sayyiduna Zaid bin Thabit (may Allah be pleased with him) was among the scribes of revelation who had sheep.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 4218
Hadith Gradingحکم دارالسلام:حديث صحيح، وهذا إسناد ضعيف، خمير بن مالك، لم يرو عنه غير أبى إسحاق السبيعي.