The Disbeliever Entering the Mosque and the Prohibition of the One in a State of Major Ritual Impurity from Entering It

Question:
If we prevent a 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 for this; there is evidence that he is prevented from the mosque. And there is evidence that the disbeliever enters the mosque, just as the delegation of Najran, who were Christians, entered upon the Prophet (peace and blessings be upon him) in his mosque. They tied a dove to the pillars before they embraced Islam, in the mosque. We follow the scholars of the past; what is reported as prohibited, we prohibit, and what is reported as permissible, we permit. Yes. Allah the Exalted knows best, and may Allah send prayers and peace upon our Prophet Muhammad and upon his family and companions.