The Messenger of Allah (ﷺ) said, "Beware of suspicion, for suspicion is the worst of false tales."[Al-Bukhari and Muslim].

The Messenger of Allah (ﷺ) said, "It is enough evil for a Muslim to look down upon his (Muslim) brother."[Muslim].

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."'[Muslim].

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."[Al-Bukhari and Muslim].

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."'[Al-Bukhari and Muslim].

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."[Muslim].

The Messenger of Allah (ﷺ) said, "When a person says: 'People have been ruined, he is the one to be ruined the most."'[Muslim]In another version: "He himself is the most ruined among them."

The Messenger of Allah (ﷺ) said, "It is not lawful for a Muslim to desert (stop talking to) his brother beyond three nights, the one turning one way and the other turning to the other way when they meet, the better of the two is one who is the first to greet the other."[Al-Bukhari and Muslim].

The Messenger of Allah (ﷺ) said, "It is not lawful for a Muslim to forsake his (Muslim) brother beyond three days; and whosoever does so for more than three days, and then dies, will certainly enter the Hell."[Abu Dawud].

The Messenger of Allah (ﷺ) said, "A woman was punished in Hell because of a cat which she had confined until it died. She did not give it to eat or to drink when it was confined, nor did she free it so that it might eat the vermin of the earth."[Al-Bukhari and Muslim]

The Messenger of Allah (ﷺ) forbade animals being tied (as targets).[Al-Bukhari and Muslim].

I was the seventh child of Banu Muqarrin and we had only one slave-girl. When the youngest of us once happened to slap her (on the face) the Messenger of Allah (ﷺ) ordered us to set her free.[Muslim].

The Prophet (ﷺ) said, "The expiation for beating or slapping a slave on the face for something he has not done is to set him free."[Muslim].

We were with the Messenger of Allah (ﷺ) in a journey when he drew apart (to relieve nature). In his absence, we saw a red bird which had two young ones with it. We caught them and the red mother bird came, beating the earth with its wings. In the meantime the Prophet (ﷺ) returned and said, "Who has put this bird to distress on account of its young? Return them to her." He (ﷺ) also noticed a mound of ants which we had burnt up. He asked, "Who has set fire to this?" We replied: "We have done so." He (ﷺ) said, "None can chastise with fire except the Rubb of the fire."[Abu Dawud].

The Messenger of Allah (ﷺ) said, "It is an act of oppression on the part of a person to procrastinate in fulfilling his obligation; if the repayment of a debt due to any of you is undertaken by a rich person, you should agree to the substitution."[Al-Bukhari and Muslim].

The Messenger of Allah (ﷺ) said, "He who gives something (to someone) as a gift and then gets it back (from him or her) is like a dog which eats its own vomit."Another narration is: "He who gets back his charity is like a dog which vomits and then returns to that and eats it."[Al-Bukhari and Muslim].

I donated a horse in the way of Allah. Its new possessor did not treat it properly. I made my mind to buy it because I thought that he would sell it at a cheap price (now that it became weak and emaciated). I asked the Prophet (ﷺ) about it, whereupon he said, "Do not buy it and do not get back your charity, for one who gets back the charity is like a dog that eats its own vomit."[Al-Bukhari and Muslim]

`Abdullah bin `Umar (May Allah be pleased with them) replied: "In the era of the Messenger of Allah (ﷺ) we considered this to be an act of hypocrisy."

[Al-Bukhari].

The Messenger of Allah (ﷺ) was asked: "Tell us about a person who does some good deed and people praise him, will this be considered as showing off?" He replied, "This is the glad tidings which a believer receives (in this life)."[Muslim].