Ali 'Imran 3:28

La yattakhithi almu/minoonaalkafireena awliyaa min dooni almu/mineena wamanyafAAal thalika falaysa mina Allahi fee shay-in illaan tattaqoo minhum tuqatan wayuhaththirukumuAllahu nafsahu wa-ila Allahi almaseer

Let not believers take disbelievers as allies [i.e., supporters or protectors] rather than believers. And whoever [of you] does that has nothing [i.e., no association] with Allāh, except when taking precaution against them in prudence. And Allāh warns you of Himself, and to Allāh is the [final] destination.

The believers must not take the disbelievers as friends instead of the believers.And whoever does that has no relation with Allah whatsoever, unless you (do so) as a protective measure (in order to) save yourself from them. Allah warns you of Himself, for unto Allah is the return.