The Messenger of Allah (ﷺ) said, "When a person calls his brother (in Islam) a disbeliever, one of them will certainly deserve the title. If the addressee is so as he has asserted, the disbelief of the man is confirmed, but if it is untrue, then it will revert to him."[Al-Bukhari and Muslim].

The Prophet (ﷺ) said, "Ruined are Al-Mutanatti'un." He repeated this thrice.[Muslim].

The Messenger of Allah (ﷺ) said, "If the wailing woman does not repent before she dies, she will be made to stand on the Day of Resurrection wearing a garment of pitch and a garment of scabies (Allah knows the nature thereof)."[Muslim].

The Messenger of Allah (ﷺ) said, "Two things are signs of disbelief on the part of those who indulge in them: Slandering one's lineage and wailing over the dead."[Muslim].

Some people asked the Messenger of Allah (ﷺ) about soothsayers. He (ﷺ) said, "They are of no account." Upon this they said to him, "O Messenger of Allah! But they sometimes make true predictions." Thereupon the Messenger of Allah (ﷺ) said, "That is a word pertaining to truth which a jinn snatches (from the angels) and whispers into the ears of his friend (the soothsayers) who will then mix more than a hundred lies with it."[Al-Bukhari and Muslim].The narration in Al-Bukhari is: "The angels descend in the clouds and mention matters which has been decreed in heaven; Satan steals a hearing (listens to it stealthily) and communicates it to the soothsayers who tell along with it a hundred lies."

Narrated Safiyyah, daughter of Abu 'Ubaid, on the authority of some of the wives of the Prophet (ﷺ) who said, "He who goes to one who claims to tell about matters of the Unseen and believes in him, his Salat (prayers) will not be accepted for forty days."[Muslim].

I heard the Messenger of Allah (ﷺ) saying, "The practice of 'Iyafah, the interpretation of omens from the flight of birds, the practice of divination by drawing lines on the ground and taking evil omens are all practices of Al-Jibt (the idol, the diviner, or sorcerer)."[Abu Dawud].

Jibril (Gabriel) (ﷺ) made a promise with the Messenger of Allah (ﷺ) to come at a definite hour; that hour came but he did not visit him. There was a staff in the hand of the Messenger of Allah (ﷺ). He threw it from his hand and said, "Never does Allah back out of His Promise, nor do His messengers." Then he noticed a puppy under his bed and said, "O 'Aishah, when did this dog enter?" She said: "By Allah, I don't know." He then commanded that it should be turned out. No sooner than had they expelled it, Jibril came and the Messenger of Allah (ﷺ) said to him, "You promised to visit me. I waited for you but you did not come." Whereupon he said: "The dog kept me from coming. We do not enter a house in which there is a dog or a picture."[Muslim].

'Ali bin Abu Talib (May Allah be pleased with him) said to me: "Shall I not send you to do a task that the Messenger of Allah (ﷺ) had assigned to me? Spare no portrait unwiped out, and leave not a high grave unlevelled."[Muslim].

The Messenger of Allah (ﷺ) said, "He who keeps a dog other than one for guarding the fields or herds or hunting, will lose two Qirat every day out of his rewards."[Al-Bukhari and Muslim].

The Messenger of Allah (ﷺ) said, "Spitting in the mosque is a sin, and its expiation is that the spittle should be buried in earth."[Al-Bukhari and Muslim].

The Messenger of Allah (ﷺ) said, "It is not proper to use the mosque for urinating or easing oneself. They are merely built for the remembrance of Allah and the recitation of the Qur'an", or as he stated.[Muslim].

A man announced (the loss of his camel) in the mosque, uttering these words: "Has any one seen my red camel?" Upon this the Messenger of Allah (ﷺ) said, "May it not be restored to you! The mosques are built for what they are meant to be (i.e., prayer, remembrance of Allah, acquiring knowledge, etc.)."[Muslim].

The Prophet (ﷺ) said, "He who has eaten from this plant (i.e., garlic) should not approach us and should not offer Salat (prayer) along with us."[Al- Bukhari and Muslim].

The Prophet (ﷺ) forbade (us) from sitting with our legs drawn up to our belly (Ihtiba') during the Friday Khutbah (religious talk before the prayer).[Abu Dawud and At-Tirmidhi].

The Messenger of Allah (ﷺ) said, "Swear neither by the name of Taghut (i.e., false deities, false leaders, etc.) nor by your fathers."[Muslim].

The Messenger of Allah (ﷺ) said to me, "When you take an oath and consider something else to be better than it, make expiation for your oath and choose the better alternative."[Al-Bukhari and Muslim].

I heard the Messenger of Allah (ﷺ) saying, "Swearing produces a ready sale for a commodity, but blots out the blessing."[Al-Bukhari and Muslim].

I heard the Messenger of Allah (ﷺ) saying, "Beware of excessive swearing in sale, because it may promote trade but this practice will eliminate the blessing."[Muslim].

The Messenger of Allah (ﷺ) said, "No one should ask in the Face of Allah for anything except Jannah."[Abu Dawud].