Surah Al-Ma'idah, ayah 51

5:51

۞ يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُواْ لَا تَتَّخِذُواْ ٱلۡيَهُودَ وَٱلنَّصَٰرَىٰٓ أَوۡلِيَآءَۘ بَعۡضُهُمۡ أَوۡلِيَآءُ بَعۡضٖۚ وَمَن يَتَوَلَّهُم مِّنكُمۡ فَإِنَّهُۥ مِنۡهُمۡۗ إِنَّ ٱللَّهَ لَا يَهۡدِي ٱلۡقَوۡمَ ٱلظَّٰلِمِينَ ٥١

Yā'ayyuhal-ladhīna āmanū lā tattakhidhul-yahūda wan-nasārā awliyā'a ba'duhum awliyā'u ba'din waman yatawallahum minkum fa innahū minhum innallāha lā yahdil-qawmaz-zālimīn

O you who have believed, do not take the Jews and the Christians as allies. They are [in fact] allies of one another. And whoever is an ally to them among you - then indeed, he is [one] of them. Indeed, Allāh guides not the wrongdoing people.