And whosoever turns away (blinds himself) from the remembrance of the Most Beneficent (Allah) (i.e. this Quran and worship of Allah), We appoint for him Shaitan (Satan – devil) to be a Qarin (an intimate companion) to him.
Meaning:-
Qarin (Arabic): Qarin literally means ‘constant companion’. A qareen pushes a person to do evil things and to disobey Allah.
Intimate: faithful, close, dear.