Questioner: Is it allowed to perform ruqya [reciting aayahs/supplications on someone who is poisoned/possessed by Jinn, etc.] through a cassette?
Al-Albaani: Is it allowed to perform ruqya what?
Questioner: … through a cassette?
Al-Albaani: … through a cassette?
Al-Albaani: … cassette.
Al-Albaani: Is the adhaan allowed? Is the iqaamah allowed [through a cassette]? If you are in doubt such that I should answer you [I will], and if you know that the answer is that it is not allowed [to call the adhaan or iqaamah using a cassette] then the answer is the same [concerning ruqya]–it is not allowed.
For this reason I said on some occasions that I think, and Allaah knows best if the report is true, that sometimes a single [unified] adhaan is played on tape–if this report is true [and people are actually doing that] then I say that I fear a day will come when the people will pray behind a cassette [recording].
Al-Huda wan-Noor, 616.