He began the midday prayer and then heard the call to the midday prayer; what is the ruling on his prayer?

Question:
He says: He said the opening takbir for the midday prayer, and in the first rak'ah he heard the adhan. What should he do?

Answer:
If he said the takbir of ihram before the time entered, the obligatory prayer is not valid. He should turn it into a voluntary prayer, complete it, and then pray the obligatory prayer after the time has entered. Yes.