Sahih Muslim Book 43, Hadith Number 7184.

Chapter : Pertaining to the Words of Allah: “Those whom they call upon, themselves seek the means of access to their Lord” (xvii. 57).

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 amongst 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.”