Abu Hurairah (May Allah be pleased with him) said: The Messenger of Allah (ﷺ) said, "Beware of suspicion, for suspicion is the worst of false tales. Do not look for other's faults. Do not spy one another, and do not practise Najsh (means to offer a high price for something in order to allure another customer who is interested in the thing). Do not be jealous of one another and do not nurse enmity against one another. Do not sever ties with one another. Become the slaves of Allah, and be brothers to one another as He commanded. A Muslim is the brother of a Muslim. He should neither oppress him nor humiliate him. The piety is here! The piety is here!" While saying so he pointed towards his chest. "It is enough evil for a Muslim to look down upon his Muslim brother. All things of a Muslim are inviolable for his brother in Faith: his blood, his wealth and his honour. Verily, Allah does not look to your bodies nor to your faces but He looks to your hearts and your deeds." Another narration is: "Do not feel envy against one another; do not nurse enmity; do not spy on one another and do not cheat one another. Be Allah's slaves, brethren to one another." Another narration is: "Do not have estranged relations with one another. Do not nurse enmity and do not feel envy against one another. O Allah's worshippers! Be brothers!" Another narration is: "Do not estrange mutual relations and do not intervene into the transaction which is likely to be settled with another person." .

Muawiyah (May Allah be pleased with him) said: I heard the Messenger of Allah (ﷺ) saying, "If you find faults with Muslims, you will corrupt them." .

It has been reported that a man was brought before Abdullah bin Mas'ud (May Allah be pleased with him) because his beard was giving out smell of wine. Ibn Mas'ud said: "We have been prohibited from spying (on Muslims) and finding faults (with them). But we can take to task only and only if the sin is overt. .

Abu Hurairah (May Allah be pleased with him) said: The Messenger of Allah (ﷺ) said, "Beware of suspicion, for suspicion is the worst of false tales." .

Abu Hurairah (May Allah be pleased with him) said: The Messenger of Allah (ﷺ) said, "It is enough evil for a Muslim to look down upon his (Muslim) brother." .

Ibn Mas'ud (May Allah be pleased with him) said: The Prophet (ﷺ) said, "The haughty, even with pride equal to a mustard seed in his heart, will not enter Jannah." A man enquired: "What about that a person likes fine dress and fine shoes?" He said: "Allah is Beautiful and likes beauty. Pride amounts to disclaiming truth out of self- esteem, and despising people ." .

Jundub bin 'Abdullah (May Allah be pleased with him) reported: The Messenger of Allah (ﷺ) said, "Once someone said: 'By Allah! Allah will not forgive such and such (a person).' Thereupon Allah, the Exalted and the Glorious, said: 'Who is he who takes an oath in My Name that I will not grant pardon to so-and-so? I have granted pardon to so-and-so and rendered your good deeds fruitless."' .

Wathilah bin Al-Asqa' (May Allah be pleased with him) said: The Messenger of Allah (ﷺ) said, "Do not express pleasure at the misfortune of a (Muslim) brother lest Allah should bestow mercy upon him and make you suffer from a misfortune." .

Abu Hurairah (May Allah be pleased with him) said: The Messenger of Allah (ﷺ) said, "Two matters are signs of disbelief on the part of those who indulge in them: Defaming and speaking evil of a person's lineage, and wailing over the dead." .

Abu Hurairah (May Allah be pleased with him) said: The Messenger of Allah (ﷺ) said, "He who takes up arms against us is none of us; and he who cheats us is none of us." . Another narration of Muslim is: The Messenger of Allah (ﷺ) happened to pass by a heap of corn. He thrust his hand in that (heap) and his fingers felt wetness. He said to the owner of that heap of corn, "What is this?" He replied: "O Messenger of Allah! These have been drenched by rainfall." He remarked, "Why did you not place this (the drenched part of the heap) over the corn so that people might see it? He who deceives is not of us."

Abu Hurairah (May Allah be pleased with him) said: The Messenger of Allah (ﷺ) said, "Do not practise Najsh (to cheat)." .

Ibn 'Umar (May Allah be pleased with them) said: The Messenger of Allah (ﷺ) prohibited the practice of Najsh. .

Ibn 'Umar (May Allah be pleased with them) said: A man mentioned to the Messenger of Allah (ﷺ) that he was often deceived in dealings. The Messenger of Allah (ﷺ) said to him, "When you enter into a transaction you should say: "There should be no deception."' .

Abu Hurairah (May Allah be pleased with him) said: The Messenger of Allah (ﷺ) said, "He who deceives another's wife or his slave is none of us." .

'Abdullah bin 'Amr bin Al-'As (May Allah be pleased with them) said: The Messenger of Allah (ﷺ) said, "Whosoever possesses these four characteristics is a sheer hypocrite; and anyone who possesses one of them possesses a characteristic of hypocrisy till he gives it up. These are: when he is entrusted with something, he proves dishonest; when he speaks, he tells a lie; when he makes a covenant, he proves treacherous; and when he quarrels, he behaves in very imprudent, evil, insulting manner." .

Ibn Mas'ud, Ibn 'Umar and Anas (May Allah be pleased with them) said: The Prophet (ﷺ) said, "For every one who breaks his covenant, there will be a (huge) flag on the Day of Resurrection and it will be said: 'This flag proclaims a breach of covenant by so-and-so."' .

Abu Sa'id Al-Khudri (May Allah be pleased with him) said: The Prophet (ﷺ) said, "Every one who breaks a covenant will have a flag by his buttocks on the Day of Resurrection. It will be raised higher according to the nature of his breach. Behold, there will be no greater a sin with respect to breaking the covenant than that of a ruler who breaks his covenant with the Muslim masses." .

Abu Hurairah (May Allah be pleased with him) reported: The Prophet (ﷺ) said, "Allah, the Exalted, says: 'I will contend on the Day of Resurrection against three (types of) people: One who makes a covenant in My Name and then breaks it; one who sells a free man as a slave and devours his price; and one who hires a workman and having taken full work from him, does not pay him his wages."' .

Abu Dharr (May Allah be pleased with him) said: The Prophet (ﷺ) observed: "There are three (types of) people to whom Allah will neither speak on the Day of Resurrection nor look at them nor purify them, and they will have a painful chastisement." The Messenger of Allah (ﷺ) repeated it three times. Abu Dharr (May Allah be pleased with him) remarked: "They are ruined. Who are they, O Messenger of Allah?" Upon this, the Messenger of Allah (ﷺ) said, "One who lets down his lower garments (below his ankels) out of arrogance, one who boasts of his favours done to another; and who sells his goods by taking a false oath." .

'Iyad bin Himar (May Allah be pleased with him) said: The Messenger of Allah (ﷺ) said, "Verily, Allah has revealed to me that you should adopt humility. So that no one may wrong another and no one may be disdainful and haughty towards another." .