Hawzah News Agency- From what was discussed, it becomes clear that the Almighty Allah, with His divine teachings, must have provided some of His servants with intuitive knowledge and laws that guarantee man's prosperity and must have sent them to lead the people.
A person who possesses divine messages is called a "nabi (prophet)" and messenger of Allah and the entire set of messages from Allah which he has brought to the people are called "religion".
It has also become clear that a prophet:
(1) Must be free and immune from error. In order to communicate what has been revealed to him to the people without error and mistake, he should be immune from forgetfulness and other mental weaknesses; otherwise, divine guidance will not attain its goal and the general guidance rule will forfeit its applicability and lose its power to influence people.
(2) Must be inviolable to error and sin both in deeds and speech, because sinfulness has no effect in propagation. People do not esteem the speech of a person whose manner and speech are at odds. They even take his deeds for his mendacity and imposture by saying if he meant what he said, he would act accordingly.
By bringing these two aspects together in one phrase, we can say that a prophet must be inviolable to errors and sins to render preaching and propagation effective. In His words, the Almighty Allah, too, refers to this point and states:
"The Knower of the unseen! so He does not reveal His secrets to any, except to him whom He chooses as a messenger. for surely He makes a guard to march before him and after him, so that He may know that they have truly delivered the messages of their Lord...(72:26-28)."
(3) Must possess moral virtues such as chastity, courage, justice, etc, for these are considered as praiseworthy qualities. Anyone who is immune to any sins and follows religion in a perfect manner will never be blemished by moral vices.
Reference:
Allamah Sayyid Muhammad Husayn Tabatabai, Islamic Teachings in Brief, Published by
Ansariyan Publications - Qom