In The Name of Allah, The Most Merciful, The Bestower of Mercy.

An Example of External and Internal Policy

Imam As-Sadi [may Allah have mercy upon him] said:

Allah [The Exalted] said:

وأعدوا لهم ما استطعتم من قوة ومن رباط الخيل ترهبون به عدو الله وعدوكم

And make ready against them all you can of power, including steeds of war to threaten the enemy of Allah and your enemy]. [Surah Al-Anfaal. Ayah 60]

Allah commanded (Muslim rulers) to prepare everything that is feasible in terms of power, including political and mental fortitude, industries, weaponry, and everything else that is used to bolster (Muslim forces) and terrify enemies- all activities related to military strategy, military arts, diverse weapons, forts, and defences against the evils of the foes.  Allah [The Exalted] said: [يا أيها الذين آمنوا خذوا حذركم – O you who believe! Take your precautions]. [Surah An-Nisaa. Ayah 71]

See how these teachings of the Islamic Shariah represent the only (correct course of action) and the most powerful means of implementing both internal and external policy! Muslims attain perfection and righteousness when they are guided by these fundamental principles and their subsidiary matters, (whereas) the deficiency that is anticipated and arises is owing to disregarding these affairs and not paying close attention to them.

And from Siyaasah Shar’iyyah (see footnote a), (we learn that) Allah guides people to establish matters of universal welfare. It is the duty of each group in society to gain in-depth knowledge of the reality of a particular aspect of this welfare, what it depends on, the avenues through which it can be achieved and perfected, and to use all reasonable efforts to deliver it as much as possible. Allah [The Exalted] said:

ولتكن منكم أمة يدعون إلى الخير ويأمرون بالمعروف وينهون عن المنكر

Let there arise out of you a group of people inviting to all that is good (Islam), enjoining Al-Ma’ruf (i.e. Islamic Monotheism and all that Islam orders one to do) and forbidding Al-Munkar (polytheism and disbelief and all that Islam has forbidden). [Surah Al Imran. Ayah 104]

Allah [The Exalted] said:
وما كان المؤمنون لينفروا كافة فلولا نفر من كل فرقة منهم طائفة ليتفقهوا في الدين ولينذروا قومهم إذا رجعوا إليهم لعلهم يحذرون

And it is not (proper) for the believers to go out to fight (Jihad) all together. Of every troop of them, a party only should go forth, that they (who are left behind) may get instructions in (Islamic) religion, and that they may warn their people when they return to them, so that they may beware (of evil). [Surah At-Tawbah. Ayah 122]

There is no question that seeking public welfare in the manner that Allah has instructed is the reason for religious and worldly perfection, as observed by everyone who is familiar with it.

Allah said:
ادع إلى سبيل ربك بالحكمة والموعظة الحسنة وجادلهم بالتي هي أحسن

Invite (mankind, O Muhammad ) to the Way of your Lord (i.e. Islam) with wisdom (i.e. with the Divine Inspiration and the Qur’an) and fair preaching, and argue with them in a way that is better]. [Surah An-Nahl. Ayah 125]

This involves preaching to Muslims who have violated certain aspects of the religion, as well as preaching to nonbelievers. Muslims are exhorted to perfect their religion, while unbelievers are called to accept Islam as the only way to rectification for humanity. This call should be based on wisdom, which is to adopt the approach that is most effective for achieving good, perfecting it, and eliminating or reducing evil in the context of time, location, people, and circumstances. (see footnote b)

Preaching should also be carried out with fine admonition, and this admonition consists of an explanation and a clarification of what is good and bad, as well as highlighting the advantages of the good outcomes in this life and the next. Because of its inherent goodness as well as its pathways that are marked by kindness, leniency, forbearance, patience, etc., Allah described this preaching as a good admonition. Additionally, if an argument is necessary to persuade someone, it should be presented in the best manner possible. The arguer should appeal for the truth, demonstrate its beauty and the evil that results from its opposite, and address any doubts raised by the opponent. This should be done with polite words and excellent manners, not with force, harshness, callousness, or verbal abuse because those things can cause great harm. Allah said:

فبما رحمة من الله لنت لهم ولو كنت فظا غليظ القلب لانفضوا من حولك فاعف عنهم

And by the Mercy of Allah, you dealt with them gently. And had you been severe and harsh-hearted, they would have broken away from about you; so overlook (their faults)]. [Surah Aal Imran Aayah 159] (see footnote c) (1)

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Footnote a: What is Siyaasah: It refers to the regulation of civic affairs and has control over both the behaviour of the person and the entire society. It involves Islamic jurisprudence, which helps the rulers gain knowledge and comprehension of the Shariah laws and principles pertaining to managing the business of the state and its structures. [At-taleeq Alaa As-Siyaasah Ash-Shar’iyyah. Slightly paraphrased. Page 5 by Imam Muhammad Ibn Saaleh al-Uthaymeen (may Allah have mercy upon him)]

NB: This Siyaasah is to be differentiated from the methodology of ISIS, Ikhwaan Al-Muslimeen, and other deviated sects. Read articles by Shaikh Abu Iyaadh [may Allah preserve him]

http://www.ikhwanis.com/authors/Abu.Iyaad.cfm?start=31

http://www.shariah.ws/authors/Abu.Iyaad.cfm

Footnote b:

https://www.salafisounds.com/lesson-10-the-methodology-of-giving-dawah-readings-from-beneficial-answers-to-questions-regarding-the-innovated-methodologies-lessons-with-abu-khadeejah-abd/

Footnote c:

Having Gentleness and Wisdom with the General Muslim who is not a Caller to Misguidance ― Emphasised by the Noble Scholar, the ʿAllāmah, Rabīʿ Ibn Hādī Al-Madkhalī (may Allāh preserve him)

A nice manner of da’wah to atheists, by our brother Anwar (Allah reward him) —calling to Tawheed with textual proofs, sound reason, and the natural disposition of people; without falling into blameworthy disputation of the people of kalām of our times. This is the way of da’wah, just as Allāh (the Mighty and Majestic) has said: “Invite to the path of your Lord with wisdom and kind admonition and debate with them in the best manner.” (An-Nahl 16:125): https://twitter.com/AbuKhadeejahSP/status/1651124440892096514

Ref 1: An Excerpt from Ad-Deenus Saheeh Yahillu Jamee al-Mashaakil (The right religion is the answer to every problem)-Page 15-16. slightly paraphrased