The Spoils of War - 8:19
If you want victory (O disbelievers), victory has come to you! It will be better for you if you desist from attacking. If you turn back, we will also turn back, and your army, however numerous, will not be able to repel you. Allah is with those who believe.
Related:
The Women/4:89
They wanted you to disbelieve as they disbelieved so that you might become one with them. Do not take any of them as friends until they take action in the way of Allah. If they turn against you, seize them and kill them wherever you find them. Take them neither as friends nor as helpers;
The Spoils of War/8:39
Fight them until they abolish oppression and oppression and make the religion the religion of Allah alone. If they cease hostility, surely Allah is All-Seeing of what you do.
The Spoils of War/8:40
If they turn back, know that Allah is your master. He is the best Mawla (Sovereign/Friend/Protector) and the best Helper.
The Night Journey/17:7
If you do good, you do good for yourselves. If you do evil, it is for yourselves. When the time of the last of them comes, they will fill you with grief and enter the mosque as they entered it the first time. They will destroy what they have captured.
The Night Journey/17:8
Your Lord has mercy on you. If you return (to corruption), We will return (to punishment). We have made Hell encompassing for the disbelievers.