The Family Of Imran - 3:103
Hold fast to the rope of Allah, and do not differ. Remember the favor of Allah upon you. When you were enemies, He united your hearts and by His favor you became brothers. You were on the edge of a pit of fire and He saved you from it. This is how Allah explains His verses so that you may be guided.
What is the intention?
The Believers/23:52
This community of yours is one community. Count me, I am your Lord.
The Believers/23:53
But they divided their affairs into various books. Each group is content with what is with it.
The Believers/23:54
Leave them in their confusion until a certain period.
The Companies/39:3
"Indeed, to Allah alone belongs religion. Those who take those other than Him as awliya (friends) say: "We serve them so that they may bring us closer to Allah". Allah will decide between them in that in which they differ. Surely Allah guides not the liars and the ungrateful."
The Cattle/6:65
"Say: "He is able to send upon you a torment from above you or from beneath your feet, or to divide you into sects and make you taste the evil of one another."See how We make clear Our verses so that they may understand."
The Romans/30:32
Those who have divided their religion into sects. Each party boasts of its own (Imam and book).
The Cattle/6:159
You have nothing to do with those who divide their religion into parts and go in groups. Their affair is up to Allah; then He will inform them of their situation.