11. A number of our people has narrated from Ahmad ibn Muhammad ibn Khalid al-Barqi from certain persons of his people from abu Sa‘id al-Khaybari from al-Mufaddal ibn ‘Umar who has said the following. “Abu ‘Abdallah said, ‘You must write down (Hadith) and spread your knowledge among your brethren. If you will die your children will inherit your books. A time will come when people will face chaos and they will find no comfort but with their books.’”