Translation:

36. If anyone withdraws himself from remembrance of (Allah) Most Gracious We appoint for him an evil one to be an intimate companion to him.

Notes (Tafseer)

4638. If men deliberately put away the remembrance of Allah from their minds, the natural consequence, under Allah's decree, is that they join on with evil. Like consorts with like. We can generalise evil in the abstract, but it takes concrete shape in our life-companions.