Assalam Aleykum,
To whom Harut and Marut said the next: "Our case is temptation for the people, so do not hide the truth." ( 2:102, the holy Quran)
When they have been in Babylon they said such words. Pay attention that Harut is Iblis and Marut is an angel was made Khalifa after Adam ( peace be upin him and All other prophets). This angel had been in Babylon already and Babylon is the earthly garden in the hollow earth. This angel has been tempted by Iblis/Harut and taken to earthly garden by him. I think they've said it to people or devils of earthly garden to teach them how to teach people of earth the magic. Am i right?