AL Quran:
 

AL Quran: Eh Imaan walo Yahud aur nasaara (christian) ko apna dost na banao wo aapas mein ek dusrey ke dost hain aur jo koi tummein se unkey saath dosti karega to wo unmein se hai , beshaq Allah Zalimo ko hidayat nahi karta
Al Quran, Al-Maeda, Chapter #5, Verse #51

Eh Imaan walo musalmano ko chor kar kaafiron ko Apna Dost na banao, kya tum ye chahtey ho ki Apney upar Allah ka sareeh ilzaam lo.
Al Quran, An-Nisa, Chapter #4, Verse #144

English Translation:
O you who believe! take not the Jews and the Christians as Auliya' (friends, protectors, helpers), they are but Auliya' of each other. And if any amongst you takes them (as Auliya'), then surely he is one of them. Verily, Allah guides not those people who are the Zalimun
Al Quran, Al-Maeda, Chapter #5, Verse #51

O you who believe! take not for Auliya' (protectors or helpers or friends) disbelievers instead of believers. Do you wish to offer Allah a manifest proof against yourselves?
Al Quran, An-Nisa, Chapter #4, Verse #144