I thought that I had finished the part of the importance of da'awa but then there are few writings behind my notes' commentaries from what I heard and read. There are few hadiths for the importance of da'awa. InshaAllah we will try to put it up here for everyone to share.
The first part of the commentary interpret the meaning of the verse 104 in Surat Aal-Imran : "And they are those who achieve success..." Although in idiomatic sense, the translation of this text seems quite stiff, but we still can sense the content of the message. It means that those who are consistent in performing da'awa are the successful ones. Why? Because through da'awa, vices and crimes could be avoided and charity or chastity will continuously flowing in the universe and the nation will be the promoter of peace and charity around the world.
Some Hindus View about Evil : Vaalmiki Ramayan
Urm, before we go further I have something to share here only for fun. During our discussion with non-Muslims for example Hindu friends. We also heard a slightly different ideas about evil or vices. They accept evil as a fact and maybe some of them were quite harsh when I talked with them but I am not a Muslim as per Muslim people everywhere talked with. I am not talking here and there to "convert" so I don't feel offended at all.
I know about this notion since before I talked face to face with them and I didn't tell them my confusing background, hehe. I read adaptations of Ramayan into Thai or Malay and Mahabharat portions through Bhagavadgita. About the monster Ravann in the Ramayan, he was a Brahman and a devout devotee of lord Shiva Shankar. He knows about the evolution of the universe, the secret of spirituality and the path to heaven from earth that made him an emperor of the three worlds. He also performed the sacrifice and penance for lord Brahma until he was granted with the boon of longer life. The roots of his fall-down began when he had kidnapped Sita Devi, the wife of Raam and it is because his mental state was damaged by evil thoughts. So, there must be something wrong with a religious guy or religious-looking guy if we see them committing evil. It does not mean that a person does not know about religious teaching. It is about at what time a person performs the act of charity and chastity? Is it continuously or at certain times?
For Muslims, Allah taught us to always pray to Him so our Faith would be strengthen and our spirit and soul would be purified through His boundless Mercy and Love.
The Importance of Amar Ma'aruf Nahi Munkar
Now back to the topic, the beginning of the verse 104 in Surat Aal-Imran is also appropriate with the hadith from our noble teacher and prophet, Muhammad s.a.w. Reported by Hudzaifa r.a from Muhammad s.a.w the prophet says: "I swear by the Lord in which myself in His grip that we are commanded by Him to diligently perform charity and to diligently prevent vices and crimes. Or else the Lord will raise up calamity upon everyone. And you will pray to Him invoking help but He will never listen to it anymore!" (Narrated by at-Tirmidzie from the report of Hudzaifa)
Sometimes, da'awa has to be a little bit stern when there are people who are stubborn, refuse to leave crime and vices and spreading mental illness to others. It is mentioned through a hadith:
"The most principal above all is the struggle with the word of Justice in front of the evil and cruel administrators, governors or earthly kings." (Narrated by Abu Dawud and at-Tirmidize from the report of Abu Sa'id al-Khudri)
In another hadith reported by Abu Sa'id al-Khudri, it says: "Any one of you who sees something evil, crime or vice so he must change it to the good and proper one with his hand. If he has no capability to change it with his hand, then with his tongue. If yet still incapable, then change it with his heart. And with the heart, it is the weakest of the Faith." (Narrated by Muslim)
The last hadith from the report of Abdullah bin Mas'ud mentions that prophet Muhammad s.a.w says: "No one of the prophets sent by the God to nations who were not accompanied amongst the nations with companions and supporters who firmly supporting the traditions and executing the command of the Lord through the tongue of noble prophets. Then appear the descents (after them) who did not walk what they talk and performing what has not been commanded by the God. And for those who oppose these with his hand, they are the faithful ones. And those who oppose these with their tongue, they are the faithful ones. And those who oppose these with their heart, they are the faithful ones. After the heart, nothing that could be mentioned as the Faith even with the size of mustard." (Narrated by Muslim)
Sealed with prayers for mercy, peace and love, amin!