friend    Al-Waliyy (2:258)

It says in the Holy Quran:


And sufficient is Allah as a Friend. (4:46)

In another place, it says:


Allah is the friend of those who believe. He brings them out of darkness into light. And those who disbelieve, their friends are the transgressors who bring them out of light into darkness. These are the inmates of the Fire; therein shall they abide. (2:258)