Hisham bin Sa'd al-Madni هشام بن سعد المدني أبو عباد · General Behavior (Kitab Al-Adab)

The Prophet (ﷺ) said: O community of people, who believed by their tongue, and belief did not enter their hearts, do not back-bite Muslims, and do not search for their faults, for if anyone searches for their faults, Allah will search for his fault, and if Allah searches for the fault of anyone, He disgraces him in his house.

when a man cures anything, the curse goes up to heaven and the gates of heaven are locked against it. Then it comes down to the earth and its gates are locked against it. Then it goes right and left, and if it finds no place of entrance it returns to the thing which was cursed, and if it finds no place of entrance it returns to the thing which was cursed, and if it deserves what was said (it…

The vilest names in Allah’s sight on the Day of resurrection will be that of a man called Malik al-Amlak. Abu Dawud said: This tradition has also been transmitted by Shu'aib b. Abi Hamzah from Abi al-Zinad through different chain of narrators. This version has the words "akhna' ismin" (most obscene name) instead of "akhna ismin" (the vilest name).

Salim ibn AbulJa'dah said: A man said: (Mis'ar said: I think he was from the tribe of Khuza'ah): would that I had prayed, and got comfort. The people objected to him for it. Thereupon he said: I heard the Messenger of Allah (ﷺ) as saying: O Bilal, call iqamah for prayer: give us comfort by it.

if a man becomes the client of any people without the permission of his patrons (i.e. those who have freed him), on him will be the curse of Allah, of angels and of all people; no obligatory or supererogatory worship will be accepted from him.