Protecting the mosques

It is narrated from Sayyiduna Mu'adh (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Keep your mosques away from your young children who lack understanding, your insane, the carrying out of the legal punishments (hudud), the drawing of swords from their sheaths, buying and selling, and your quarrels and disputes; perfume your mosques with the smoke of incense on the day of Jumu'ah, and set up places of ablution at their doors for purification."
This narration is munqati' (has a broken chain).

It is narrated from Sayyiduna Abu Ayyub al-Ansari (may Allah be pleased with him) that a man picked a louse from his garment and threw it in the mosque, so the Messenger of Allah (peace and blessings be upon him) said to him (out of regard for the cleanliness and purity of the mosque): "Put it back in your garment."
This narration is munqati' (has a broken chain).

Imam Ishaq (may Allah have mercy on him) also recorded a narration of the same meaning through Yazid bin Harun, Muhammad bin Ishaq and Talhah bin Abdullah bin Kariz, from an elder of the people of Madinah: that the Messenger of Allah (peace and blessings be upon him) saw a man who had picked up a louse; then he mentioned the whole story like the previous narration.

It is narrated from Sayyiduna Jubayr bin Mut'im (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) forbade "carrying out the legal punishments (hudud) in the mosques, reciting poetry in them, or drawing and brandishing weapons inside them."
The chain of this narration is hasan (good), provided that Ishaq bin Yasar heard it directly from Sayyiduna Jubayr (may Allah be pleased with him).

It is narrated from Sayyiduna Jubayr bin Mut'im (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "The legal punishments (hudud) prescribed by Allah Almighty are not to be carried out in the mosques."
Imam al-Harith recorded this narration in his Musnad; its chain contains Muhammad bin Umar al-Waqidi, who is not free from criticism.

It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that, while delivering a sermon on a rainy day, he said: "Offer the prayer in your homes and lodgings, and do not carry this filth and mud to the mosque on your feet, for it is not possible for all the neighbours of the mosque to have the strength or means to clean and purify this filth (stuck to your feet)."
This narration is sahih (authentic); Imam Musaddad narrated it, and its basic meaning is also established in the two Sahihs.

It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Spitting inside the mosque is a sin and an evil deed, and burying it (in the earth and the like) is a good deed and an act of reward."
The chain of this hadith is hasan (good); Imam Abu Bakr bin Abi Shaybah narrated it in his work, and sahih hadith of this meaning are also found in other books of Sunan, which stress the etiquette, respect and cleanliness of the mosque.

It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that he said: "When you see an old man reciting poetry in the mosque on the day of Jumu'ah and recounting the events and tales of the days of Ignorance (Jahiliyyah), then strike him on the head with a stick."
This narration is sahih (authentic) and mawquf (stopping at the Companion).

It is narrated from Sufyan bin Uyaynah (may Allah have mercy on him) that he said: I saw the Messenger of Allah (peace and blessings be upon him) in a dream, and I said to him: "O Messenger of Allah! What do you say about this hadith that is narrated from you: 'Indeed, the angels are hurt and displeased by the things that hurt the children of Adam'?" He (peace and blessings be upon him) said: "It is entirely true and right."
[Takhrij: Musnad al-Humaydi: 364]

It is narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with him) that he was asked about (eating) garlic, and he said: "In those days there was no garlic in our land (Madinah); rather, the things whose eating was forbidden (at that time) were onion and leek (a foul-smelling vegetable resembling onion and garlic)."
Takhrij: Sahih Muslim (564), Sunan al-Nasa'i (708).

It is narrated from Sayyiduna Ali (may Allah be pleased with him) that he said: "The Messenger of Allah (peace and blessings be upon him) commanded us to eat garlic," and he (peace and blessings be upon him) said (because of the hurt its smell causes the angels): "Were it not that the angel descends to me (with revelation), I would certainly eat it."
The hadith of Sayyiduna Jabir (may Allah be pleased with him) concerning the dislike of sleeping in the mosque will come in the chapter on the virtues of Sayyiduna Ali (may Allah be pleased with him).