Backbiting

​Some are of the same nature as that of the swine
Imam Ibn al-Qayyim al-Jawziyyah

​Beware of the supplication of the oppressed, O you who follows up the mistakes of the people! 
​Imam Ibn al-Qayyim al-Jawziyyah

Who is the Muslim from whose speech, words and actions other people are safe?
Shaykh Saalih Al-Fawzaan

What is the way out of these fitan (tribulations)?
Shaykh 'Abdul-'Azeez Aal ash-Shaykh

Following the faults of the Muslims
Shaykh Muhammad bin Saalih al-'Uthaymeen

Ruling on a Muslim describing another as stupid or a fool
Shaykh 'Abdul-'Azeez bin Baaz

One's own wellbeing is a desired matter
Shaykh Muhammad bin Saalih al-'Uthaymeen

The situations in which it is permissible to speak about a Muslim brother
Permanent Committee for Scholarly Research and Ifta'

People being tested with the disease of al-Qeel wal-Qaal and falling into childish behaviour!
Shaykh Muhammad ibn Salih Al-'Uthaymeen