The other most esteemed etiquette of this month for religious scholars, jurisprudents, congregational prayer imams, and preachers is to preach and admonish, and in summary - the scholar who has spent years of his age in the path of achieving knowledge and asceticism, and through the experience of these long years has identified Satan's astonishing tricks as well as the self's unique plans for entrapment of human beings - it would be appropriate for him to preach and admonish and should not deprive the people from his guidance and rich experience. Because, the gains and benefits received by others through these preaching, guidance, and admonishment cannot be accomplished through any other religious deeds. And it is therefore, from this consideration, that the religion has recommended it profoundly, and in this regard, there are plenty of traditions, narrated from the sinless Imams [a], which cannot be described here. Of course, in preaching and leading the congregational prayer, what is more important than any other thing is sincerity, purity and abstinence from egotism and hypocrisy.
Especially, preaching and admonishing which are relatively more esteemed acts and are more beneficial as compared to other deeds, unfortunately they are more vulnerable to injuries and calamities as compared to other deeds. Therefore, from this consideration the one who wants to perform this act, first of all must examine himself thoroughly, and if does not have any other motive except Allah's pleasure and people's guidance - he should undertake it. But if he discovers other than this, then instead of engaging himself in preaching, with sincerity and purity of heart, should engage himself in self-purification and self-refinement. And if he does so, Allah (the Glorious, the Exalted), in accordance with the following verse of the Holy Qur'an would bestow upon him the required grace to succeed in this task.
"And those who strive in Our (cause), We will certainly guide them to Our path."
ـ Holy Qur'an (29:69)