In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
Imaam As-Sadi [may Allaah have mercy upon him] said:
Allaah [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 (tanks, planes, missiles, artillery, etc.) to threaten the enemy of Allah and your enemy]. [Surah Al-Anfaal. Aayah 60]
Allaah commanded (Muslim Governments) to prepare what is possible of strength- political and mental strength, industries, weapons and all that is used to strengthen the (Muslim armies) and terrify the enemies. This includes everything that takes place and happens in relation to military planning, military arts, various weapons, forts and fortifications against the evils of the enemies. Allaah [The Exalted] said: [يا أيها الذين آمنوا خذوا حذركم – O you who believe! Take your precautions]. [Surah An-Nisaa. Aayah 71]
So, see how these teachings of the Islamic Sharee’ah is solely the affair and the best way to conduct the most powerful internal and external policies. Perfection and righteousness are acquired when Muslims are guided through them and by its fundamental principles and subsidiary matters; (whereas) the deficiency that is expected and occurs is due to neglecting these affairs and not giving them close attention.
Commentary: Preparing the means to strength is not left in the hands of individuals and thus leads to chaos, transgression, enmity, oppression and violating the rights of others; rather this affair is the responsibility of the ruler under the politics of the state by way of that which is facilitated of understanding based on the Qur’aan and Sunnah. (1)
Imaam Abdul Azeez Bin Baaz [may Allaah have mercy upon him] said: One of the dangerous causes (of weakness)- its outcomes and what it necessitate – is that which has occurred in terms of weakness in the presence of the enemy and being delayed in everything, except that which Allaah wills to remain; inclining towards forbidden desires, preoccupation with what hinders from the path of Allaah and guidance, lack of preparation for the enemy in the arena of industry, lack of sufficient weaponry that frightens the enemy, strive against him in Jihaad, take one’s rights from him, lack of preparing the bodies for Jihaad and not spending money in what is obligatory (or befitting) to prepare against the enemy, guarding against his evil, defend the religion and the homeland. The preparation is weak or nonexistent and the goals are skewed, except that which Allaah wills.
Therefore, the path of success, the path of progress in the presence of the enemies and the absence of weakness, the path of prosperity and success, the path to obtaining lofty status and the lofty things that are to be sought after, victory over the enemies- the path to all of this is to embrace beneficial knowledge and sound understanding in the religion, give precedence to Alllaah’s pleasure over His displeasure, give close attention to what Allaah has obligated, abandon what Allaah has made unlawful and repent truthfully to Allaah from one’s sins and shortcomings. Also there should be industry in the Muslim countries, preparation and strength that will enable every individual through every means, so that he has no need of the enemy, until the enemy knows what he has of preparation and talent, and so that the enemy is afraid of him, treats him fairly and gives him his rights. The bodies are to be prepared and should refrain from over-indulging in that type of luxury that will weaken strength and the hearts when required to fight the enemy, and so that one has strength to perform Jihaad. There should be full cooperation between the state and the people on what is required of obedience to Allaah and His Messenger, refraining from what Allaah [The Mighty and Majestic] has forbidden and also cooperating on what is required to make preparations, just as Allaah [The Exalted] said: [وَأَعِدُّواْ لَهُم مَّا ٱسۡتَطَعۡتُم مِّن قُوَّةٍ۬ – And make ready against them all you can of power]. [Surah Al-Anfaal. Aayah 60]
It is necessary to prepare physically, prepare equipment (of war) and other types of equipment in all respects so that we can suffice with what Allaah [Glorified be He] has given us and not to be in need of what our enemies have, because fighting our enemies with what is in their possession is very difficult to obtain. If the enemy prevents you from acquiring weapons, then what do you fight with alongside poor insight and little knowledge? It is necessary to prepare what is possible, and what is possible is sufficient as long as the Muslims intend to do without their enemy, fight their enemy, save their country, intending to establish the command of Allaah in the land, and intending (to gain reward) in the Afterlife as much as they can, because indeed Allaah [Glorified and Exalted be He] says: [وَأَعِدُّواْ لَهُم مَّا ٱسۡتَطَعۡتُم مِّن قُوَّةٍ۬ – And make ready against them all you can of power]; but Allaah did not say, “And make ready against them that which is equal to their power”, because that may not be possible to achieve. If the Muslims are sincere, join hands, prepare for their enemy with as much equipment they can and support the religion ordained by Allaah, then indeed Allaah [Glorified and Exalted be He] will support them, place them in front and above the enemy, and not under the enemy. Allaah – the One who is truthful in His speech and promise – said: [يَـٰٓأَيُّہَا ٱلَّذِينَ ءَامَنُوٓاْ إِن تَنصُرُواْ ٱللَّهَ يَنصُرۡكُمۡ وَيُثَبِّتۡ أَقۡدَامَكُمۡ – O you who believe! If you help (in the cause of) Allah, He will help you, and make your foothold firm]. [Surah Muhammad. Aayah 7]
Allaah is neither unable nor in need of the people, but He puts His good servants to trial by way of the evil ones, so that the truthfulness of the truthful ones is distinguished from the lies of the liars, the one who truly strives in the path of Allaah is distinguished from others, and the one desirous of safety (in this life and the next) is distinguished. This is the reason, otherwise Allaah is able to aid His allies and destroy His enemies without war- without the need for Jihaad, preparation and other things, as Allaah [Glorified be He] says:
[ذَٲلِكَ وَلَوۡ يَشَآءُ ٱللَّهُ لَٱنتَصَرَ مِنۡہُمۡ وَلَـٰكِن لِّيَبۡلُوَاْ بَعۡضَڪُم بِبَعۡضٍ۬ۗ- But if it had been Allah’s Will, He Himself could certainly have punished them (without you). But (He lets you fight), in order to test you, some with others]. [Surah Muhammad. Aayah 4] (2)
Must read these important articles compiled by Shaikh Abdul Waahid Abu Khadeejah [may Allaah preserve him]:
[Ref 1: An Excerpt from 53mins 52secs to 55mins 38secs: https://www.al-badr.net/detail/hKHE35qsTg ]
[Ref 2: https://binbaz.org.sa/discussions/42/%D8%A7%D8%B3%D8%A8%D8%A7%D8%A8-%D8%B6%D8%B9%D9%81-%D8%A7%D9%84%D9%85%D8%B3%D9%84%D9%85%D9%8A%D9%86-%D8%A7%D9%85%D8%A7%D9%85-%D8%B9%D8%AF%D9%88%D9%87%D9%85-%D9%88%D9%88%D8%B3%D8%A7%D9%89%D9%84-%D8%A7%D9%84%D8%B9%D9%84%D8%A7%D8%AC. paraphrased]