Rules of the mosque regarding buying and selling, sitting after Fajr, and prohibition of making graves into mosques

This excerpt is taken from the Arabic book Al-Awamer wal-Nawahi by Sheikh Hussain bin Mubarak Al-Mawsili, whose Urdu translation has been done by Muhammad Sarwar Gohar Sahib under the title Ahkamat o Mamnooat.

Prohibition of Buying and Selling in the Mosque​

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① Sayyiduna Amr bin Shu'aib رضي الله عنه narrates from his father, who narrates from his grandfather, that the Messenger of Allah صلی اللہ علیہ وسلم forbade buying and selling in the mosque, poetry recitation, and sitting in circles before the Friday prayer on the day of Jumu'ah.

Reference: Abu Dawood, Kitab al-Salat, 1079. Tirmidhi, Kitab al-Salat, Hadith 322.

② Sayyiduna Abu Hurairah رضي الله عنه narrates that he heard the Messenger of Allah صلی اللہ علیہ وسلم say:
إذا رأيتم من يبيع أو يبتاع فى المسجد فقولوا: لا أربح الله تجارتك، وإذا رأيتم من ينشد ضالة فى المسجد فقولوا: لا رد الله ضالتك
"When you see someone buying and selling in the mosque, say: May Allah not make your trade profitable, and when you see someone announcing a lost item in the mosque, say: May Allah not return your lost item."

Reference: Tirmidhi, Kitab al-Buyu', 1321. Muslim, Kitab al-Masajid wa Mawadi' al-Salat, Hadith 568/79.

Sitting in the Mosque Until Sunrise​

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① Samak bin Harb, may Allah have mercy on him, narrates that I asked Sayyiduna Jabir bin Samrah, may Allah be pleased with him: Did you sit with the Messenger of Allah, peace and blessings be upon him? He said: Yes, the Prophet, peace and blessings be upon him, used to sit most of the time until the sun rose in the same place where he performed the morning prayer. When the sun rose, he would stand up. And they (the Companions, may Allah be pleased with them) used to talk about the days of ignorance and then laugh, and the Messenger of Allah, peace and blessings be upon him, would smile.

Reference: Muslim, Hadith 6700.

② Samak bin Harb, may Allah have mercy on him, also narrates from Jabir bin Samrah, may Allah be pleased with him, that when the Messenger of Allah, peace and blessings be upon him, finished the Fajr prayer, he would sit in the same place until the sun rose.

Reference: Muslim, Kitab al-Masajid wa Mawadi' al-Salah, 6700. Abu Dawood, Kitab al-Salah, 4850. Tirmidhi, Kitab al-Jumu'ah from the Messenger of Allah, peace and blessings be upon him, 585.

Prohibition of Making Graves into Mosques​

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① Sayyiduna Abu Hurairah رضي الله عنه narrates, the Messenger of Allah صلی اللہ علیہ وسلم said:
قاتل الله اليهود والنصارى اتخذوا قبور أنبيائهم مساجد
"May Allah destroy the Jews and Christians, for they have made the graves of their Prophets عليه السلام places of prostration."
And in another narration:
لعن الله اليهود والنصارى اتخذوا قبور أنبيائهم مساجد
"May Allah curse the Jews and Christians, for they have made the graves of their Prophets عليه السلام places of prostration."

Reference: Bukhari, Book of Prayer, 437. Muslim, Book of Mosques and Places of Prayer, 530/20.

② Sayyiduna Anas رضي الله عنه was asked, what did you hear from the Messenger of Allah صلی اللہ علیہ وسلم regarding garlic? He said, the Prophet صلی اللہ علیہ وسلم said:
من أكل من هذه الشجرة الخبيثة فلا يقربن مسجدنا
"Whoever eats from this harmful plant should not come near our mosque."

Reference: Bukhari, Book of Adhan, Hadith 856. Muslim, Book of Mosques and Places of Prayer, Hadith 562/70.