The Quran and Muslim Unity | One Ummah

Muslims are supposed to work together towards a common goal set by the Quran and shown by the Prophet (PBUH). They are brothers and sisters because they are bonded by the common ideology of the unity of God and the unity of humankind.

إِنَّمَا الْمُؤْمِنُونَ إِخْوَةٌ

The Believers are but a single Brotherhood [Yusuf Ali]

This is the foundation of Islam. The Quran and the Sunnah of the Prophet (PBUH) require Muslims to work for the unity of the Ummah.

The Quran is very clear about it:

وَاعْتَصِمُوا بِحَبْلِ اللَّـهِ جَمِيعًا وَلَا تَفَرَّقُوا

And hold fast, all of you together, to the Rope of Allah (i.e. this Quran), and be not divided among yourselves. [Hilali & Khan]

إِنَّ الَّذِينَ فَرَّقُوا دِينَهُمْ وَكَانُوا شِيَعًا لَّسْتَ مِنْهُمْ فِي شَيْءٍ ۚ إِنَّمَا أَمْرُهُمْ إِلَى اللَّـهِ ثُمَّ يُنَبِّئُهُم بِمَا كَانُوا يَفْعَلُونَ

As for those who divide their religion and break up into sects, thou hast no part in them in the least: their affair is with God. He will in the end tell them the truth of all that they did. (6:159) [Yusuf Ali]

وَلَا تَكُونُوا مِنَ الْمُشْرِكِينَ ; مِنَ الَّذِينَ فَرَّقُوا دِينَهُمْ وَكَانُوا شِيَعًا ۖ كُلُّ حِزْبٍ بِمَا لَدَيْهِمْ فَرِحُونَ

And be not ye among Mushrikeen (those who join gods with God), – i.e., those who split up their Religion, and become Sects, – each party rejoicing in that which is with itself! (30:31-32) [Yusuf Ali]