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

Imaam as-Sadi [may Allaah have mercy upon him] said:

One of the greatest Islamic principles is that Muslims are urged to adhere to their religion, fulfil servitude to Allaah and the rights of Allaah, fulfill the rights of people, to be upon agreement and unity, strive to adhere to what will bring about harmony and love, and remove hatred and grudges. Allaah [The Exalted] said: [ إنما المؤمنون إخوة – Verily the believers are brothers in Islamic faith]. [Surah Al-Hujuraat. Aayah 10]

Allaah said: [واذكروا نعمة الله عليكم إذ كنتم أعداء فألف بين قلوبكم فأصبحتم بنعمته إخوانا – And hold fast, all of you together, to the Rope of Allah (i.e. this Qur’an), and be not divided among yourselves, and remember Allah’s Favour on you, for you were enemies one to another but He joined your hearts together, so that, by His Grace, you became brethren (in Islamic Faith)]. [Surah Aal Imran. Aayah 103]

Allaah said: [فاتقوا الله وأصلحوا ذات بينكم وأطيعوا الله ورسوله إن كنتم مؤمنين – So fear Allah and adjust all matters of difference among you, and obey Allah and His Messenger (Muhammad ), if you are believers]. [Surah Al-Anfaal. Aayah 1]

Allaah said: [ولا تكونوا كالذين تفرقوا واختلفوا من بعد ما جاءهم البينات – And be not as those who divided and differed among themselves after the clear proofs had come to them]. [Surah Aal Imran. Aayah 105]

Allaah said: [واعتصموا بحبل الله جميعا – And hold fast, all of you together, to the Rope of Allah (i.e. this Qur’an and the Sunnah)]. [Surah Aal Imran. Aayah 103]

And there are other texts that establish this great principle by way of which the affairs of the Muslims are established upon uprightness and raise them to the highest station of human perfection.

Allaah said:

يَا أَيُّهَا الَّذِينَ آمَنُوا إِذَا لَقِيتُمْ فِئَةً فَاثْبُتُوا وَاذْكُرُوا اللَّهَ كَثِيرًا لَّعَلَّكُمْ تُفْلِحُونَ
وَأَطِيعُوا اللَّهَ وَرَسُولَهُ وَلَا تَنَازَعُوا فَتَفْشَلُوا وَتَذْهَبَ رِيحُكُمْ ۖ وَاصْبِرُوا ۚ إِنَّ اللَّهَ مَعَ الصَّابِرِينَ
وَلَا تَكُونُوا كَالَّذِينَ خَرَجُوا مِن دِيَارِهِم بَطَرًا وَرِئَاءَ النَّاسِ وَيَصُدُّونَ عَن سَبِيلِ اللَّهِ ۚ وَاللَّهُ بِمَا يَعْمَلُونَ

O you who believe! When you meet (an enemy) force, take a firm stand against them and remember the Name of Allah much (both with tongue and mind), so that you may be successful. And obey Allah and His Messenger, and do not dispute (with one another) lest you lose courage and your strength depart, and be patient. Surely, Allah is with those who are As-Sabirin (the patient ones, etc.). And be not like those who come out of their homes boastfully and to be seen of men, and hinder (men) from the Path of Allah. and Allah is Muhitun (encircling and thoroughly comprehending) all that they do. [Surah Al-Anfaal. Aayaat 45-47]

So, Allaah commanded them to obey Him and His Messenger, and this includes the entire religion; forbade them from the differing that would necessitate disharmony and enmities that will weaken faith; commanded them to remember Him a lot in every affair and that they exercise patience on which every matter depends; commanded them to be sincere and truthful, and forbade what is in opposition to it, such as Riyaa (see footnote a), boasting, pride, bad intentions and the desire to mislead people.

Commentary: This is also guidance which the Islamic Sharee’ah brought for the Islamic Ummah- that they establish brotherhood upon true Islamic faith, hearts united and having love for one another. Allaah said: [ إنما المؤمنون إخوة – Verily the believers are brothers in Islamic faith]. [Surah Al-Hujuraat. Aayah 10]

The Prophet [peace and blessings of Allaah be upon him] said, “Be servants of Allah as brothers”. [Saheeh Muslim. Hadeeth Number 2564] (see footnote b)

The Muslims are commanded to eagerly seek to put a stop to enmity and grudges, put a stop to the causes of splitting, blameworthy differing and argumentation, so that their hearts become one (in harmony) and united. The Prophet [peace and blessings of Allaah be upon him] said, “The parable of the believers in their affection, mercy, and compassion for each other is that of a body. When any limb aches, the whole body reacts with sleeplessness and fever”. [Saheeh Muslim. Hadeeth Number 6011]

Then the author cited a number of proofs regarding this affair, such as the statement of Allaah: [ إنما المؤمنون إخوة – Verily the believers are brothers in Islamic faith]. [Surah Al-Hujuraat. Aayah 10]

And the statement of Allaah: [واذكروا نعمة الله عليكم إذ كنتم أعداء فألف بين قلوبكم فأصبحتم بنعمته إخوانا – And hold fast, all of you together, to the Rope of Allah (i.e. this Qur’an), and be not divided among yourselves, and remember Allah’s Favour on you, for you were enemies one to another but He joined your hearts together, so that, by His Grace, you became brethren (in Islamic Faith)]. [Surah Aal Imran. Aayah 103]

And the statement of Allaah: [فاتقوا الله وأصلحوا ذات بينكم وأطيعوا الله ورسوله إن كنتم مؤمنين – So fear Allah and adjust all matters of difference among you, and obey Allah and His Messenger (Muhammad ), if you are believers].

And the statement of Allaah: [ولا تكونوا كالذين تفرقوا واختلفوا من بعد ما جاءهم البينات – And be not as those who divided and differed among themselves after the clear proofs had come to them]. [Surah Aal Imran. Aayah 105]

And the statement of Allaah: [واعتصموا بحبل الله جميعا – And hold fast, all of you together, to the Rope of Allah (i.e. this Qur’an and the Sunnah)].

These verses of Qur’aan establish a general foundation which the people of true Islamic faith must adhere to and that is to establish true brotherhood in faith, love for the sake of Allaah, prevent the causes of splitting, discord and blameworthy differing, and that they all hold onto the rope of Allaah (the Qur’aan and Sunnah) and not be divided. So, if they are like this, they will become strong, blessed with mighty honour and safety from defeat. Allaah said: [ وَلَا تَنَـٰزَعُواْ فَتَفۡشَلُواْ وَتَذۡهَبَ رِيحُكُمۡ‌ۖ -And do not dispute (with one another) lest you lose courage and your strength depart]. [Surah Al-Anfaal. Aayah 46] (see footnote c)

This is a principle that will lead them to every honour and virtue.

The author cited these two Aayaat – (i.e. Aayaat numbers 45-47 Surah Al-Anfaal) – that gathers a number of affairs regarding how a person should conduct himself when dealing with his affairs and with others, which the people of Islam must adhere to, especially when meeting the enemy in battle. (see footnote d) The first affair is that they obey Allaah and Allaah’s Messenger. The entire religion enters into this first affair and it is the foundation upon which the true believer adheres to in his dealings at home and abroad. Then Allaah forbade them from disputing that would necessitate disharmony, the enmity that would weaken faith and lead to defeat. Then Allaah commanded them to remember Him a lot – which is an aid in every affair that is pursued, and commanded them to have patience. He commanded them to be sincere and truthful, and forbade them from what is in opposition to this, such as Riyaa, boasting, pride, bad intentions and a desire to misguide the people. (1)

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Footnote a: Riyaa: Footnote a: Allaah’s Messenger (salallaahu ‘alaihi wassallam) said: “That which I fear for you the most is the Minor Shirk.” They asked: “O Allaah’s Messenger! What is Minor Shirk?” He replied: “It is ar-Riyaa’. Allaah will say on the Day when He will recompense the servants in accordance to their deeds: Go to the ones for who whom you showed-off these deeds, desiring to be seen by them in the world. Look and see, do you find with them a reward?” Read more on this link: https://abukhadeejah.com/ahmad-an-najmees-kitaab-at-tawheed-chapter-3-fear-of-falling-into-shirk/

Footnote b: Abu Huraira [may Allaah be pleased with him] reported that Allaah’s Messenger [peace and blessings of Allaah be upon him] said, “Do not envy each other, do not outbid each other, do not hate each other, do not turn away from each other, and do not outsell each other. Rather, be servants of Allah as brothers. The Muslim is the brother of another Muslim. He does not wrong him, nor humiliate him, nor look down upon him. Righteousness is here,” and he pointed to his chest three times. The Prophet said, “It is enough evil for person to look down upon his Muslim brother. The entirety of the Muslim is sacred to another Muslim: his life, his wealth, and his honour”. [Saheeh Muslim. Hadeeth Number 2564]

Footnote c: Sound Unity: 

Admonition Regarding Sound Unity – By Shaikh Rabee and Shaikh Saaleh Al-Fawzaan

Obedience to The Messenger Leads to Unity And Bidah Is The Cause of Splitting And Blameworthy Differing

Footnote d: https://abukhadeejah.com/salafi-shaikh-fawzaan-on-jihaad-in-our-times-and-the-guidelines-of-jihaad-according-to-islam/

[Ref 1: An Excerpt from 45mins 26secs to 52mins 13secs. https://www.al-badr.net/detail/hKHE35qsTg paraphrased]