The tradition of hand-scribing the Quran dates back to the time of the Prophet Muhammad who had several companions responsible for memorising and writing down the revelations as they were received. The Quran consists of 114 chapters of varying lengths, each known as a sura. Suras are classified as Meccan or Medinan, depending on whether the initial verses were revealed before or after the migration of the Prophet Muhammad to the city of Medina.