3. Ali 'Imran
آل عمران
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لَّا يَتَّخِذِ ٱلْمُؤْمِنُونَ ٱلْكَـٰفِرِينَ أَوْلِيَآءَ مِن دُونِ ٱلْمُؤْمِنِينَ ۖ وَمَن يَفْعَلْ ذَٰلِكَ فَلَيْسَ مِنَ ٱللَّهِ فِى شَىْءٍ إِلَّآ أَن تَتَّقُوا۟ مِنْهُمْ تُقَىٰةً ۗ وَيُحَذِّرُكُمُ ٱللَّهُ نَفْسَهُۥ ۗ وَإِلَى ٱللَّهِ ٱلْمَصِيرُ
The believers should not make the disbelievers their allies rather than other believers- anyone who does such a thing will isolate himself completely from God- except when you need to protect yourselves from them. God warns you to beware of Him: the Final Return is to God.
3:28