Allah
Says:
"Shall I inform you upon whom the devils descend? They descend upon every sinful liar. They pass on what is heard and most of them are liars." [Ash-Shu'ara (26): 221-223]
"And whoever is blinded from remembrance of the Most Merciful - We appoint for him a devil, and he is to him a companion." [Az-Zukhruf (43): 36]