The traditions which ascribe to Mahomet a prejudice against writing, appear to
  have no good foundation. They originated, no doubt, in the circumstance that
  he himself had little,, if any, knowledge of the art. It was the pious fashion
  to follow his example and practice, to the minutest particular; hence Ibn
  Masûd, Abu Horeira, and others of the more scrupulous believers, hesitated to
  commit the Prophet's sayings to writing, and the report of his having
  forbidden the practice thus gained currency. On the other hand, we have
  evidence which makes it highly probable that even during the lifetime of
  Mahomet there were persons who kept up memoranda of his utterances. At any
  rate, there is frequent notice of the custom shortly after his death. Thus we
  find mention of the son of Abbâs (the uncle of Mahomet) having left behind
  him a camel load of manuscripts, from which both Ikrima and Ibn Ocba made
  copious extracts. Aly copied out certain precepts of the Prophet regarding the
  ransom of prisoners, etc.; and, in order to have them constantly at hand, tied
  the roll round the handle of his sword. Another hero made use of his boot as a
  receptacle for the same purpose. It is related of an early Collector of
  tradition, that he carried about with him a portfolio filled with pages of
  leather; and the famous Zohri, when other material failed, made notes of what
  was told him upon his yellow boots, and copied them out in order afterwards.
  The practice increased so rapidly, that towards the end of the first century,
  Omar II. (with a view analogous to that which induced Abu Bekr to direct the
  collection of the Coran) issued orders for a complete compilation of all
  recorded traditions; but he died before the work was accomplished. According
  to the strict canon of the Sunna, the object of written collections was not to
  supersede, but only to assist, the  memoriter preservation of tradition; for
  oral repetition was still the inexorable rule. Indeed, the prejudice against 
  recorded collections even yet ran so high, that instances are given of
  Collectors committing their treasures to the flames (not without regret when
  the loss was found irreparable), or leaving instructions to their executors to
  destroy them after