Surah Aali Imran (The Family of Imran), Verse 103

وَاعْتَصِمُوْا بِحَبْلِ اللّٰهِ جَمِیْعًا وَّلَا تَفَرَّقُوْا وَاذْكُرُوْا نِعْمَتَ اللّٰهِ عَلَیْكُمْ اِذْ كُنْتُمْ اَعْدَآءً فَاَلَّفَ بَیْنَ قُلُوْبِكُمْ فَاَصْبَحْتُمْ بِنِعْمَتِهٖۤ اِخْوَانًا وَكُنْتُمْ عَلٰی شَفَا حُفْرَةٍ مِّنَ النَّارِ فَاَنْقَذَكُمْ مِّنْهَا كَذٰلِكَ یُبَیِّنُ اللّٰهُ لَكُمْ اٰیٰتِهٖ لَعَلَّكُمْ تَهْتَدُوْنَ ۟

Wa'tasimoo bi Hablil laahi jamee'anw wa laa tafarraqoo; wazkuroo ni'matal laahi alaikum iz kuntum a'daaa'an fa allafa baina quloobikum fa asbah tum bini'matiheee ikhwaananw wa kuntum 'alaa shafaa hufratim minan Naari fa anqazakum minhaa; kazaalika yubaiyinul laahu lakum aayaatihee la'allakum tahtadoon

“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.”

Quran 3:103 (Yusuf Ali Translation)