Is there a prohibition against standing up or leaving the mosque during the adhan?

Question:
Honorable Shaykh, may Allah grant you success. The questioner asks: Is there a prohibition against standing up or leaving the mosque during the adhan?

Answer:
Yes. Leaving the mosque falls into two categories. If he is leaving to perform wudu' and then returning, there is no blame on him.
Because he is considered to be in the status of one sitting in the mosque. However, if he is going out, that requires consideration. If he is the imam of another mosque and is going to pray with his congregation, there is nothing wrong with it. This is an excuse for him. Or if he has an appointment with someone and he would miss the appointment, there is nothing wrong with it. This is if his leaving is for an excuse, and the mu'adhdhin is calling the adhan, or if he leaves after the adhan for a legitimate religious excuse, there is nothing wrong with it. But if he leaves without an excuse, it is not permissible. When a man left the mosque, Abu Hurayrah said, and after the adhan, Abu Hurayrah said: As for this one, he has disobeyed Abu al-Qasim (peace and blessings be upon him).