A common religious manuscript would be a copy of the Qur'an, which is the sacred book of Islam. The Qur'an is believed by Muslims to be a divine revelation (the word of god) to the prophet Muhammed, revealed to him by Archangel Gabriel. Qur'an manuscripts can vary in form and function. Certain manuscripts were larger in size for ceremonial purposes, others being smaller and more transportable. An example of a Qur'an manuscript is the Blue Koran. The Blue Koran is ceremonial in nature, which a Hafiz would utilize. It has gold Kufic script, on parchment dyed blue with indigo. Many Qur'an manuscripts are divided into 30 equal sections (juz) to be able to be read over the course of 30 days. The Chinese practice of writing on paper, presented to the Islamic world around the 8th century, enabled Qur'ans to be begin to be written on paper. The decrease in production costs of Qur'an manuscripts due to the transition from parchment to paper enabled Qur'ans to be utilized more frequently for personal use/worship, rather than just ceremonial settings.