Overview
Muhammad lived in the 7th century CE, in Arabia in a time when many people were not literate. The Arabs preserved their histories, genealogies, and poetry by memory alone. When Muhammad proclaimed the verses later collected as the Quran, his followers naturally preserved the words by memorizing them.
Early accounts say that the literate Muslims also wrote down such verses as they heard them. However, the Arabic writing of the time was a scripta defectiva, an incomplete script, that did not include vowel markings or other diacritics needed to distinguish between words. Hence if there was any question as to the pronunciation of a verse, the memorized verses were a better source than the written ones. The huffaz were also highly appreciated as reciters, whose beautifully intoned words were accessible even to the illiterate. Memorization required no expensive raw materials (in an age when there was no paper in the Muslim world, only vellum). Memorization was also considered more secureāa manuscript could easily be destroyed, but if the Qur'an was to be memorized by many huffaz, it would never be lost.
Even after Caliph Uthman ibn Affan collected and organized the Quran circa 650-656 CE, recitation (from memory) of the Quran was still honored and encouraged. There are numerous traditions of recitation. Most huffaz know only one version, but true experts can recite in several traditions.
Huffaz are highly respected within the Islamic community. They are privileged to use the title "Hafiz" before their names. They are tested on their knowledge. For example, in one test they are asked to continue the recitation of a passage taken randomly from the Quran. As they do not know which passage will be chosen, they must know the whole text in order to be sure of passing. In another test, a would-be hafiz might be asked to recite verses containing a specific word or phrase.
Most huffaz have studied as children in special Islamic schools or madrasahs, being instructed in tajweed (rules of recitation) and vocalisation as well as committing the Quran to memory. To give some idea as to the nature of this undertaking: The Quran is divided into 114 Surahs (chapters), containing 6,236 verses (comprising some 80,000 words or 330,000 individual characters).
It is important to note however that in the classical Arabic lexicon, the word hafiz was not traditionally used to refer to one who had memorized the Quran. Instead, the word used was hamil (i.e., one who carries.) Hafiz was used for the scholars of hadith, specifically one who had committed 100,000 hadiths to memory (for example, Ibn Hajar al-Asqalani).
Read more about this topic: Hafiz (Quran)