صحیح مسلم · Hadith 7557

Abdullah b. Mas'ud said in connection with the verse: Those whom they call upon, themselves seek the means of access to their Lord, that that verse was revealed in connection with a party of Arabs who used to worship a group amnogst the jinn; the jinn embraced Islam but the people kept worshipping them without being conscious of it. Then this verse was revealed: Those whom they call upon, themselves seek the means of access to their Lord.