(Certain Jews and Christians Cannot Be Friends*)
O you who believe, do not take certain Jews and Christians as allies; these are allies of one another. Those among you who ally themselves with these belong with them. God does not guide the transgressors.
يٰأَيُّهَا الَّذينَ ءامَنوا لا تَتَّخِذُوا اليَهودَ وَالنَّصٰرىٰ أَولِياءَ بَعضُهُم أَولِياءُ بَعضٍ وَمَن يَتَوَلَّهُم مِنكُم فَإِنَّهُ مِنهُم إِنَّ اللَّهَ لا يَهدِى القَومَ الظّٰلِمينَ
yaaa aiyuhal lazeena aamanoo laa tattakhizul Yahooda wan nasaaraaa awliyaaa’; ba’duhum awliyaaa’u ba’d; wa mai yatawallahum minkum fa innahoo minhum; innal laaha laa yahdil qawmaz zaalimeen
*5:51 Relations with other people are governed by the basic rule in 5:57 & 60:8-9. The Jews and Christians who cannot be friends are specifically mentioned in 5:57; they are the ones who mock and ridicule the believers, or attack them.