Ruling on Converting a Voluntary Prayer into an Obligatory One

Question:
May Allah reward you with good. This questioner, Umm Khalid from Abha, says: I have some questions and I hope you will issue a ruling on them. I am a woman who prayed four rak'ahs of voluntary prayer before the 'Asr prayer, but the mu'adhdhin called the adhan while I was in the first rak'ah, so I changed my intention to make it an obligatory prayer, and I was praying at home. What is the ruling? I should mention that I made up that prayer later the same day, after asking one of the brothers, about an hour later, when I prayed the obligatory prayer again. What is the ruling?

Answer:
Yes, it is not permissible for you to convert a voluntary prayer into an obligatory one. This is not permissible. Rather, the opposite is what is permissible: converting an obligatory prayer into a voluntary one, if this is for a valid purpose. What you did is not correct. However, the ruling you acted upon by making up the prayer is a correct ruling, so do not return to doing such a thing. Yes.