First: the factors of sin in the prophets are not effective against the factors that prevent them; That is, ignorance and the predominance of lusts as two important factors in the occurrence of sins are excluded from their existence due to the vast knowledge and the surrounding of the prophets with the ugliness of their actions.
Second: The purpose of sending prophets is to guide mankind. This goal will be achieved if people have no doubts about their words and teachings and trust them.
Third: If any type of sin occurs among the prophets, the purpose of their mission, which is to guide mankind, will be violated, because people consider the possibility of lies and distortion of facts, errors and mistakes in every word or behavior of prophets.
Fourth: If God gives His prophecy to someone who tells lies, makes mistakes, and commits sins, He has prepared the means to mislead His servants.
Fifth: Every mission needs competence and ability appropriate to that mission. Incompetent people and those who do not have the talent for that mission cannot do their duty properly.