The Messenger of Allah (ﷺ) said, "If anyone hears a man inquiring in the mosque about something he has lost, he should say: 'La raddaha Allahu 'alaika (May Allah not restore it to you),' for mosques are not built for this purpose."[Muslim]

The Messenger of Allah said, "When you see someone buying or selling in the mosque, say to him: 'La arbaha-Allahu tijarataka (May Allah not make your bargain profitable)!' When you see someone announcing something lost in it, say: 'May Allah not restore it to you!"'[At-Tirmidhi].

The Prophet (ﷺ) said, "He who has eaten garlic should not come to our mosque."[Al-Bukhari and Muslim].The narration in Muslim is: "He who has eaten garlic should not come to our mosques."

"O you people! You eat garlic and onion. I think the odour of these to be very offensive. I saw that if the Messenger of Allah (ﷺ) happened to find a man with such offensive odour in the mosque, he would order him to be taken out of the mosque and sent to Al-Baqi'. He who wants to eat any of these, should cook them till their odour dies out.[Muslim].

I heard a man saying: "No, by the Ka'bah." I admonished him: "Do not swear by any thing besides Allah, for I heard the Messenger of Allah (ﷺ) saying, 'He who swears by anyone or anything other than Allah, has indeed committed an act of Kufr or Shirk'."[At- Tirmidhi].[Some 'Ulama' are of the opinion that the words of the Prophet (ﷺ) that "He who swears by anyone or anything other than Allah has indeed committed an act of Kufr or Shirk," are in the nature of extreme admonition. And in fact, it is not Shirk. The same applies to the saying of the Prophet (ﷺ), who said, "showing off is Shirk."]

The Prophet (ﷺ) said, "Of the major sins are: Associating anything in worship with Allah, disobedience to the parents, killing without justification and taking a false oath (intentionally)."[Al- Bukhari].Another narration is: A bedouin came to the Prophet (ﷺ) and asked him: "O Messenger of Allah, what are the cardinal sins?" He (ﷺ) replied, "Associating anything with Allah in worship." The man asked: "(What is) next?" The Messenger of Allah (ﷺ) replied, "Al-Yamin Al-Ghamus." He asked: "What do you mean by Al-Yamin Al-Ghamus?" The Messenger of Allah (ﷺ) replied, "Swearing falsely to usurp the property of a Muslim."

The Messenger of Allah (ﷺ) said, "Do not address a hypocrite with the title of chief, (or similar titles of respect) for even if he deserves this title you will invite Allah's Wrath by using it for him."[Abu Dawud].

The Messenger of Allah (ﷺ) visited Umm Sa'ib (or Umm Musaiyyab) and asked her, "What ails you O Umm Sa'ib (or Umm Musaiyyab)? You are shivering." She replied: "It is a fever, may Allah not bless it!" He said to her, "Do not revile fever, for it cleanses out the sins of the sons of Adam in the same way that a furnace removes the dirt of iron."[Muslim].

The Messenger of Allah (ﷺ) led the Fajr prayer at Al-Hudaibiyyah after a rainfall during the night. At the conclusion of prayer, he turned towards the people and said, "Do you know what your Rubb has said?" They replied: "Allah and His Messenger know better." Upon this he remarked, "He has said: 'Some of My slaves have entered the morning as My believers and some as unbelievers. He who said: We have had a rainfall due to the Grace and Mercy of Allah, believes in Me and disbelieves in the stars; and he who said: We have had a rainfall due to the rising of such and such star, disbelieves in Me and affirms his faith in the stars."'[Al-Bukhari and Muslim].

The Messenger of Allah (ﷺ) said, "A true believer does not taunt or curse or abuse or talk indecently."[At-Tirmidhi].

The Prophet (ﷺ) said, "None of you should say: 'My soul has become evil.' He should say: 'My soul is in bad shape."'[Al-Bukhari and Muslim].

The Messenger of Allah (ﷺ) said, "None of you should use the word Al-Karm for grapes, for Al-Karm is a Muslim (worthy of respect)."[Al- Bukhari and Muslim]Another narration is: "Verily, Al-Karm is the heart of a true believer."Another narration is: "People have named grapes as Al-Karm; verily, only the heart of a believer is Al-Karm."

The Prophet (ﷺ) said, "Do not say Al-Karm when talking about grapes but say Al-'Inab or Al-Habalah."[Muslim].

The Messenger of Allah (ﷺ) said, "When one of you supplicates, let him be decisive and he should not say: 'O Allah, bestow upon me such and such if You wish', because no one has the power to compel Him."[Al-Bukhari and Muslim].

The Messenger of Allah (ﷺ) said, "If a man calls his wife to his bed and she refuses, and thus he spends the night angry with her, the angels continue cursing her till the morning."[Al-Bukhari and Muslim].

I heard the Messenger of Allah (ﷺ) saying, "No Salat (prayer) should be performed when the food has been served, nor should it be performed when a person is in need of relieving himself."[Muslim].

The Quraish were anxious about a woman from Banu Makhzum who had committed theft and asked : "Who will speak to the Messenger of Allah (ﷺ) about her?" Then they said: "No one will be bold enough to do so except Usamah bin Zaid, the (Companion who was) dearly loved by the Messenger of Allah (ﷺ)." So Usamah (May Allah be pleased with him) spoke to him and the Messenger of Allah (ﷺ) (angrily) said, "Are you interceding regarding one of the punishments prescribed by Allah?" He then got up and delivered an address in which he said, "Indeed what destroyed the people before you was just that when a person of high rank among them committed a theft, they spared him; but if the same crime was done by a poor person they inflicted the prescribed punishment on him. I swear by Allah that if Fatimah daughter of Muhammad should steal, I would have her hand cut off."[Al-Bukhari and Muslim].In another narration 'Aishah (May Allah be pleased with her) said: (Upon hearing the intercession of Usamah), the face of the Messenger of Allah (ﷺ) changed color (because of anger) and he said, "Do you dare to intercede in matters prescribed by Allah?" Usamah pleaded: "O Messenger of Allah! Pray for my forgiveness." 'Aishah (May Allah be pleased with her) added: Thereafter the Messenger of Allah (ﷺ) gave orders to have that woman's hand cut off.

The Messenger of Allah (ﷺ) forbade urinating into stagnant water.[Muslim].

The Messenger of Allah (ﷺ) said, "Do not meet the merchandise till they arrive in the market."[Al-Bukhari and Muslim].

The Messenger of Allah (ﷺ) said, "None of you should point at his brother with a weapon because he does not know that Satan may make it lose from his hand and, as a result, he may fall into a pit of Hell-fire (by accidentally killing him)."[Al-Bukhari and Muslim].The narration in Muslim is: Abul-Qasim (i.e., the Messenger of Allah) (ﷺ) said, "He who points at his (Muslim) brother with a weapon is cursed by the angels even if the other person should be his real brother."