The Pilgrimage - 22:40
"Those who were unjustly expelled from their land only because they said: "Our Lord is Allah". If Allah had not defended some of the people against others, the monasteries, churches, synagogues and masjids in which Allah´s Name is much mentioned would have been destroyed. Allah will surely help those who help Him. Allah is Mighty, Powerful,"
If Allah had not defended some of the people against others:
The Cow/2:251
Finally they defeated them by Allah´s permission. David killed Goliath. Allah gave him sovereignty and understanding and taught him whatever He willed. The earth would have been corrupted if Allah had not repelled some of the people with some of the people. But Allah is gracious to all creatures.
The Spoils of War/8:73
And those who disbelieve are friends of one another. If you do not implement these commandments, there will be chaos and great mischief in the earth.