Wahy (revelation), which literally means ‘to speak fast and secretly', ‘to command', ‘to inspire', ‘to imply or to refer to' or ‘to send a messenger' in Arabic, is a supernatural and mystic phenomenon that is described in the science of Islamic exegesis (tafsir) as revelation from Allah Almighty to His messengers in a manner, the nature of which is unknown to us, or His communication from behind a veil or communication from Him through His messengers of whatever He wishes, with His permission.

Due to the fact that it may be difficult for ordinary people to directly receive the Divine message, owing to their nature and position, the message has been sent from the Divine world into the human world via angels to a human prophet, and the revelation has been simplified to a level at which it can be understood by human beings. The duty of the angel is to safely take the revelation, that is, the divine message, to the prophet and supervise while the prophet explains this revelation to the people, and to protect the prophet, as he is human, from any mistakes that he may make.