Religious preaching which means the scientific, pure, and systematic invitation of the people to God and His messages and placing people in the orbit of the right path towards God is the best practice from the perspective of the Qur'an. Religious preachers should be similar to the prophets and have moral and ethical attitudes, in order to receive and convey the message of God like the successful prophets. If religious preachers suffer from moral and theological qualities, they cannot succeed in solving their addressees' problems and their shortcomings. The purpose of ethical issues of residing missioners is the shortcomings and obstacles that religious clergies engage in in a village or in a nomadic city or area and, with those issues, cannot perform their duties. The ethical issues of the clergies stem from a variety of factors; some of the ethical issues of residing missioners such as non-observance of trusts in religion preaching, politics, and learning are due to the weakness of religious knowledge. Other aspects, such as the inability to influence and transform, derive from practical inequity with virtues Religion and the content of religion, a series of issues such as lack of purity of purpose and humility, courage to present a divine message, and fear of loss of position, are due to financial problems, and the other factors, such as not being serious about communicating the message of religion, artificial behavior, taking away the necessary promotional skills, and lack of knowing the addressees due to lack of interest in preaching.