Is it permissible to refuse a visitor who arrives suddenly without prior notice, and what are the Islamic legal limits and rulings concerning the guest, the hosts, and the visitor?

There is no obligation to receive a visitor, and a Muslim does not sin if they turn them away. This is indicated by the words of Allah Almighty: "And if you find no one therein, do not enter them until permission has been given to you. And if it is said to you, 'Go back,' then go back; it is purer for you. And Allah is Knowing of what you do."

However, it is preferable not to refuse to receive guests if there is no valid excuse, especially for the wife's mother. If food is requested, one should politely apologize while noting that it could have been prepared if the visit had been announced in advance.

One must be cautious of Satan, who may exploit such situations to cause discord. The Messenger of Allah, peace and blessings be upon him, said: "Indeed, Iblis places his throne upon water; he then sends out his detachments. The closest to him in rank are the greatest in temptation. One of them comes and says: 'I did such and such,' and he says: 'You have done nothing.' Then one of them comes and says: 'I did not leave him until I separated him from his wife' - he said - 'So he draws him near him and says: 'Yes, you!'"

The etiquette of visiting and hospitality should be observed, such as choosing an appropriate time for the visit and not repeating it annoyingly. The Prophet, peace and blessings be upon him, said: "Visit sparingly; you will increase in love." Moderation in it is recommended, neither too little to be deficient nor too much to be boring.

Among the etiquette of visiting is informing the household in advance, and among the etiquette of hospitality is showing cheerfulness and a good reception, as did the Prophet of Allah, Ibrahim, peace be upon him.