Questions and Answers
Is it permissible for the Non-Muslim to enter The Mosque to listen to a lecture?
Assalāmu `alaikum Warahmatullāhi Wabrakatuh,
Yes, this is permissible, if we are confident that this Non-Muslim will not disrespect the mosque, because he is entering for a reason, and not to harm or damage the mosque. Similarly it is permissible for a kaafir to enter and stay in the mosque to repair something in the mosque, because this is in the interests of the mosque, so it is also permissible for him to enter to listen to lectures which may be the cause of his being guided. The Prophet (saw) tied up Thumaamah ibn Athaal in the mosque [when he was a prisoner of war, before he became a Muslim].
And Allah Ta'āla Knows Best,