Is the prayer valid during the adhan, or is it obligatory to wait until it ends, given that I recite the supplication before the adhan finishes?

Question:
May Allah reward you with good, and may He do you good. Is the prayer valid during the adhan? Or is it obligatory to wait until the adhan ends? I recite the supplication that is obligatory to say, then I begin the prayer, and the adhan has not finished yet?

Answer:
If the mu'adhdhin calls the adhan and you are praying a voluntary prayer, you complete it, even if the mu'adhdhin is calling. You complete the prayer you started. If you finish it and some of the adhan remains, you follow the mu'adhdhin in it, and you recite the dhikr after the adhan. As for when the adhan begins, the recommended practice for you is to wait and follow the mu'adhdhin, then recite the prescribed supplication after the adhan, and then enter into the prayer you want, so that you combine the two virtues. If you say the takbir while the mu'adhdhin is calling and you pray, that is permissible, but you miss following the mu'adhdhin. So waiting until the mu'adhdhin finishes his adhan, then reciting the dhikr after following the mu'adhdhin, is better, and then you do the prayer you want. This applies to anyone other than the one who enters on the day of Jumu'ah while the imam is on the minbar and the mu'adhdhin is calling. Yes.
So the best for him is to pray the two rak'ahs while the mu'adhdhin is calling. He hastens to pray the two rak'ahs so that he is free to listen to the khutbah. Yes.