Surah An-Nisa, ayah 144

يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُواْ لَا تَتَّخِذُواْ ٱلۡكَٰفِرِينَ أَوۡلِيَآءَ مِن دُونِ ٱلۡمُؤۡمِنِينَۚ أَتُرِيدُونَ أَن تَجۡعَلُواْ لِلَّهِ عَلَيۡكُمۡ سُلۡطَٰنٗا مُّبِينًا ١٤٤

Yā'ayyuhal-ladhīna āmanū lā tattakhidhul-kāfirīna awliyā'a min dūnil-mu'minīna aturīdūna an taj'alū lillāhi 'alaykum sultānam mubīnā

O you who have believed, do not take the disbelievers as allies instead of the believers. Do you wish to give Allāh against yourselves a clear case?