In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
Quote: “Disobedience can appear agreeable to a human being, such as Gheebah, Nameemah, self-praise and being quarrelsome – whether uttered blatantly or indirectly, verbally abusing the one you hate, praising the one you love and what is similar to that. The intense urge to engage in these deeds agrees with the soul’s desire, becomes easy for the tongue to move and thus one’s patience weakens; so due to this the Messenger [peace and blessings of Allaah be upon him] said to Mu’aadh [may Allaah be pleased with him], ‘Restrain your tongue’, so Mu’aadh said, ‘O Messenger of Allaah! Will we be held accountable for what we say?’ He said, ‘May your mother be bereaved of you, O Mu’aadh! Is there anything that topples people on their faces – or he said on their noses into the fire- other than the harvest of their tongues?!'” [Sharh Ar-Risaalah Al-Mughniyah Fis Sukoot Wa Luzoomil Buyoot. Lesson 1]
Regarding the statement, “May your mother be bereaved of you, O Mu’aadh!” The Arabs used this statement for the purpose of persuasion and exhortation, and they did not intend its apparent meaning, which is “May his mother lose him”, rather what is intended is persuasion and exhortation. [Sharh Al-Arba’een An-Nawawiyyah’ by Imaam Muhammad Ibn Saaleh Al-Uthaymeen (may Allaah have mercy upon him). Hadeeth Number 29, page 295]