Commentary
The first (63) of the four verses from Surah Al-Anfal cited above describes the cause of Muslim victory and the method through which it was achieved. In the verse appearing previous to it (62), the address was to the Holy Prophet ﷺ where he was told that it was but Allah who had helped him in His own special way, and through the community of Muslims with him. This verse is telling us that help from the community of Muslims can only be made available when this community is mutually in agreement with each other and united as one. Thus, the power and weight it carries emerges to the measure of cohesion and unity it has. If relationship based on mutual unity is strong, the whole community is strong and if this mesh of relationships is loose, the whole community turns incoherent and weak. In this verse, Allah Ta` ala has mentioned his particular blessing which was bestowed on common Muslims for their help and support to the Holy Prophet ﷺ whereby their hearts were filled with perfect unity and love. Though, before the migration of the Holy Prophet ﷺ to Madinah, deadly wars had been fought between two of their tribes, Aws and Khazraj. As for mutual disputes, they were a regular feature of their lives. But, it was the barakah of the Holy Prophet ﷺ that Allah Ta` ala made sworn enemies loving brothers to each other. So, the real cause of the establishment and survival of the new Islamic state at Madinah and that of its dominance over enemies was nothing but the help and support given by Allah Ta` ala - and the apparent cause was the mutual love and unity among Muslims.
Alongwith it, also made clear in this verse is the fact that uniting the hearts of different people and infusing them with love and concern for each other is something beyond human control. This can be done only by Him who has created all. If someone were to spend the entire wealth of the world to make this happen by creating love in the hearts of people who hate each other, even then, this feat shall remain beyond his reach and control.
Real and Lasting Unity among Muslims depends on Obedience to Allah Ta` ala
This also tells us that uniting the hearts of people and making them mutually filled with love for each other is a blessing from Allah and it is also obvious that this blessing cannot be hoped for in the presence of disobedience to Allah Ta` ala, in fact, for any hope to have His blessing, obedience to Him and the seeking of His pleasure are binding conditions.
No sensible person from any religion or community would differ about unity among individual and social groups as being commendable and beneficial. Therefore, everyone who is concerned about reforming people puts stress on uniting them together. But, the world at large (as we have found it and fashioned it) is unaware of the reality of things - that full and lasting unity cannot be forged and received on an assembly line through pragmatic designs. This can be achieved only through obedience to Allah Ta` ala and the seeking of His pleasure. The Holy Qur'an has pointed out to this reality in several verses. For instance, at one such place, it was said: وَاعْتَصِمُوا بِحَبْلِ اللَّـهِ جَمِيعًا وَلَا تَفَرَّقُوا (Hold the cord of Allah firmly, all of you, and do not be divided - 3:103). Given here is the method of avoiding differences and dissensions. The method is that everyone should firmly hold on to the cord of Allah - the Qur'an or the Shari'ah of Islam - and, as a result, everyone shall stand united together all by themselves and all mutual differences would evaporate from the scene. As for the normal difference of opinion, that is something else. If it remains within its limits, it never becomes the cause of dissensions and disputes. Dispute and disorder erupt only when the limits of Shari’ ah are crossed. In our day, everyone loves to harp on unity. But, the meaning of unity everyone is fond of taking is: If people agree to what I say, everyone will stand united. And others too who are equally concerned about unity would very much like them to agree to what they say, and thus claim that this is the only way for all to be united. Although, when a normal difference of opinion is inevitable, even necessary, among reasonable and honest people, then, it is evident that should everyone make his or her agreement with the other person depend on the eventuality that the other person agrees to what he or she says, then, mutual unity cannot materialize until the Day of Doom. Instead of all that, there is just no sound and natural format of unity other than that which has been given by the Holy Qur'an - that both parties sit together and agree to what a third party has to say, and this third party has to be the one about whom it is certain that the decision of this party will be free of error. It goes without saying that Allah alone can be such a decision-maker. It is for this reason that, in the present verse, it has been advised that everyone should hold on to the cord of Allah firmly and jointly whereby mutual disputes will evaporate in thin air and perfect unity shall prevail.
In Surah Maryam, it was said: إِنَّ الَّذِينَ آمَنُوا وَعَمِلُوا الصَّالِحَاتِ سَيَجْعَلُ لَهُمُ الرَّحْمَـٰنُ وُدًّا ﴿96﴾ (Surely, among those who believe and do good deeds, the All-Merciful [ Allah ] generates love - 19:96). This verse makes it clear that the real method through which hearts shall be filled with genuine love and intense fellow feeling is adherence to the dictates of Faith and insistence on doing what is good and right. Without it, even if some kind of unity could be artificially arrived at, that 'unity' will be simply baseless and weak making it disintegrate at the slightest provocation or pressure - something commonly noticed in the experiences of peoples around the whole world. In short, for our instant purpose, this verse explains how the blessing which was bestowed by Allah Ta` ala on the Holy Prophet ﷺ - a blessing which was to generate mutual love into the hearts of all tribes of Madinah making them all set to help and support the Holy Prophet ﷺ went on to turn his supporters into an iron wall for him.