Because of the profound effect which it had upon the lives of the Muslims both publicly and privately, the pact of fraternity which was sealed between the Muhaajirun and the Ansaar is worthy of further consideration. As for its effect upon public life, the pact was the central pivot around which the concept of the Muslim "Ummah" began to take shape, the idea of a community founded upon the belief in Allah, and living according to the precepts of this belief. The bonds established by belief were to take precedence before those of blood, lineage and descent, before those of a nation and tongue, race and class. Belief would not be contradicted by anything. This was ordained by Allah who said:
"Hold tightly together to the Rope of Allah (the Qur'an) and differ not amongst one another. Remember the blessings of Allah upon you. Though you were enemies, he knit your hearts together and you became, by His grace, brothers, though you were on the edge of the abyss of Hell, He snatched you away from it. Thus, Allah reveals to you His signs, perhaps you will be guided. And let there be among you a nation inviting to goodness, which enjoins righteousness anf forbids wrong-doing, such are they who shall know success. Do not be like those who quarrel and bicker after clear signs have come to them, their's shall be a monstrous punishment." (Aal-'Imraan, aayah 103-105)
And so the believers had become one anothers allies, each of them loving his brother as he loved his own soul, helping him, defending his interests, and looking after him as he would any beloved relation.
"The believing men and women are allies of one another." (at-Tawbah, aayah 71)
So they support one another as if they were one body, "The believer is to the believer like a building, part of which supports the other" (Al-Bukhaari). Nu'maan Ibn Bashir reports that the Messenger (peace and blessings of Allaah be upon him) said, "You see the believers' love and affection for one another are like a single body; if any part of it hurts, the rest of it feels its pain, in fever and sleeplessness." (Al-Bukhaari).
Allah commended the Muhajirun and the Ansaar. He says about the Muhajirun:
"It is for the poor emigrants who left their homes and their possessions, seeking the pleasure and bounty of Allah, helping Allah and His Messenger. It is they who are sincere." (al-Hashr, aayah 8)
And He says about the Ansaar:
"Those who, before them, made their home in the city and had adopted the faith, love those who emigrate to them; they have no jealousy for that which they have been given, and give them (emigrants) preference over themselves, even though they were in need of that. Whosoever is saved from his own greed, such are they who shall be the succesfull." (al-Hashr, aayah 9).]
Much more than this though, the Ansaar sheltered the Prophet (peace and blessings of Allaah be upon him) and those who arrived with him; they shielded them and helped them, sacrificing everything for the pleasure of Allah until their love itself emanated from the belief that every Muslim is guided by his Lord. Anger and aversion towards them was hypocrisy itself, as the hadith says, "The mark of belief is love for the Ansaar, and the mark of hypocrisy is anger at them." (Al-Bukhaari). The Prophet (peace and blessings of Allaah be upon him) said, "The Ansaar are loved by no one but the believers and are angered by no one but the hypocrites, so whoever loves them, Allah will love him, and whoever reviles them, Allah will revile them." (Al-Bukhaari)
At the root and cause of this fraternity is Islam. Islam forms the basis of society and it must remain under the banner of Allah, to be ruled by His Shari'ah. It must enjoin to righteousness and forbid iniquity. Its monasticism is Jihaad, its road is the call to Allah, and its life is guided by the Sunnah. The strong amongst the Muslims are mild until their right is denied them, and the meek amongst them are mighty once they are wronged. They are allied to Allah, to His Messenger and to the Believers, and their anger and ire are for the enemies of Allah even if they are their closest kin. They strive earnestly for the sweet taste of faith and know disbelief and its people with such claritythat any one of them would rather be cast into a raging fire rather than return to disbelief after Allah had saved him from it. As the Messenger said, "No one will find the sweetness of faith until the love he seeks is only for Allah; until being cast into a raging fire is preferable to him than being returned to disbelief, after Allah had saved him from it; until Allah and His Messenger are more dear to him than anything else at all." [Al-Bukhaari).