When the Prophet salAllahu alaihi wasalam migrated to Medina, before he even built the masjid, he established the brotherhood between the ansari and mujahideen.
Surah Al Imran 3:103
“And hold fast, all together, by the rope which Allah (stretches out for you), and be not divided among yourselves; and remember with gratitude Allah’s favour on you; for ye were enemies and He joined your hearts in love, so that by His Grace, ye became brethren; and ye were on the brink of the pit of Fire, and He saved you from it. Thus doth Allah make His Signs clear to you: That ye may be guided.”
Surah Az Zukhruf 43:67
“Friends on that Day will be foes one to another except the Righteous.”
