Prohibiting the one in major ritual impurity from the mosque and the entry of a disbeliever into it

Question:
Honorable Shaykh, may Allah grant you success, if we prevent the Muslim who is in a state of major ritual impurity from staying in the mosque, how do some scholars permit a disbeliever to enter the mosque?

Answer:
There is evidence that he is prevented from the mosque, and there is evidence that a disbeliever enters the mosque, just as they entered upon the Prophet (peace and blessings be upon him) in his mosque. The delegation of Najran, who were Christians, entered upon the Prophet (peace and blessings be upon him) in the mosque, and Thumamah ibn Uthal was tied up in the mosque before he embraced Islam. We follow the evidence; what is prohibited in the evidence we prohibit, and what is permitted in the evidence we permit. And Allah the Exalted knows best, and may Allah send prayers and peace upon our Prophet Muhammad, and upon his family and his Companions.