Al-Qur'an : Surat Al-i-'Imran

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 favor 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. 3:103

Let there arise out of you a band of people inviting to all that is good, enjoining what is right, and forbidding what is wrong: They are the ones to attain felicity.
3:104

Be not like those who are divided amongst themselves and fall into disputations after receiving Clear Signs: For them is a dreadful penalty, -
3:105

On the Day when some faces will be (lit up with) white, and some faces will be (in the gloom of) black: To those whose faces will be black, (will be said): "Did ye reject Faith after accepting it? Taste then the penalty for rejecting Faith."
3:106

But those whose faces will be (lit with) white, - they will be in (the light of) Allah’s mercy: therein to dwell (forever).
3:107

These are the Signs of Allah. We rehearse them to thee in Truth: And Allah means no injustice to any of His creatures.
3:108

To Allah belongs all that is in the heavens and on earth: To Him do all questions go back (for decision).
3:109

Ye are the best of peoples, evolved for mankind, enjoining what is right, forbidding what is wrong, and believing in Allah. If only the People of the Book had faith, it were best for them: among them are some who have faith, but most of them are perverted transgressors.
3:110