Question: Are we allowed to talk about worldly affairs in the Mosque? Ans: It is disliked AI-Haakim reported in al-Mustadrak (4/359) that Anas ibn MaaIik (may Allaah be pleased with him) said: The Messenger of Allaah}") said: "There will come a time when people will sit in circles in the mosques and they will have no concern except this world. Allaah has no need of them, so do not sit with them". This is a saheeh hadeeth even though al-Bukhaari and Muslim did not narrate it. Al-Dhahabi said in al-Talkhees that it is saheeh. This hadeeth states that this blameworthy deed is disliked because the mosques are not built for such a purpose. https://islamqa.info/en/answers/4448