The preaching sharia for a scholar is given in Quran along with strategy of Preaching.
Please see:
Preaching Obligation Of The Scholars: Discussion 27896
Strategy Of Preaching: Discussion 27951
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In Farahi Discourse, we extract principles from Quran and see ahadith in the light of those principles. Ahadith represent situational matters from where absolute principles cannot be extracted. They need to be studied in-depth to understand the underlying context and the content contained in them.
The hadith being quoted above is mentioned in Sahih Muslim 867a (https://sunnah.com/muslim:867a), 867b (https://sunnah.com/muslim:867b) and 867c (https://sunnah.com/muslim:867c). In the second variant of the same narration i.e. 867b, it is clearly mentioned that this regarding Friday Sermon of Prophet Muhammad (sws) “خُطْبَةُ النَّبِيِّ صلى الله عليه وسلم يَوْمَ الْجُمُعَةِ“. Now Friday Sermon is for advice and for warning and Inzar (waaz-o-Nasihat) which requires that Muslims be reminded of their true purpose which is the success on the day of judgement. In such instance, such emotional aggression is understandable and this is not to undermine anyone, rather it is for the purposes of Tazkir and emanates out of compassion for all the Muslims.
Such should be this enthusiasm that a sermon-giver’s addressees should feel as if he is speaking his heart out to them. The Makkan surahs of the last two groups of the Quran are a very good example of this aspect. If one reads them, one can feel the fire and fury which pervades them. It is as if one can hear roars of thunder and the resounding of waves as they strike the shore. This feature emanates in a true preacher out of the strength of his ideology, his conviction and his sympathy and compassion for his addressees. It makes him a person possessed with the mission of communicating as far as he can the fact that people must make themselves ready for the Day of Judgement.
In other situations of actual Dawah (preaching), the attitude and strategy of Prophet Muhammad (sws) is known to be very polite and full of wisdom and patience. And this is right in accordance with Quran 16:125-126. The Prophet is reported to have said:بَشِّرُوْا وَلَا تُنَفِّرُوْا (give glad tidings to people and do not spread hatred among them) (https://sunnah.com/bukhari:69). Consequently, while stating a principle, he has also said:
فَإِنمَّاَ بُعِثْتُمْ مُيَسِّرِيْنَ وَلَمْ تُبْعَثُوْا مُعَسِّرِيْنَ
You have been sent to create ease and you have not been sent to create difficulty. (https://sunnah.com/bukhari:6128).
Therefore, there is no absolute principle to be emotionally aggressive at all occasions, rather it is the situation coupled with wisdom which determines what is the right strategy is a particular situation. Adopting an aggressive style in every occasion which undermines a particular group of Muslims is rather detrimental to the true preaching spirit required by Quran.