Allah says in Quran:
يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُواْ ٱجۡتَنِبُواْ كَثِيرٗا مِّنَ ٱلظَّنِّ إِنَّ بَعۡضَ ٱلظَّنِّ إِثۡمٞۖ وَلَا تَجَسَّسُواْ وَلَا يَغۡتَب بَّعۡضُكُم بَعۡضًاۚ أَيُحِبُّ أَحَدُكُمۡ أَن يَأۡكُلَ لَحۡمَ أَخِيهِ مَيۡتٗا فَكَرِهۡتُمُوهُۚ وَٱتَّقُواْ ٱللَّهَۚ إِنَّ ٱللَّهَ تَوَّابٌ رَّحِيمٌ
O you who believe! Avoid much suspicion; indeed some suspicions are sins. And spy not, neither backbite one another. Would one of you like to eat the flesh of his dead brother? You would hate it (so hate backbiting) And fear Allāh. Verily, Allāh is the One Who forgives and accepts repentance, Most Merciful.
Surah Al-Hujuraat: Ayah 12
- Tajassus linguistically: It is taken from jassa al-khabar to mean searched and looked for some news. Tajassus is searching for the hidden parts of things, mainly used in an evil sense. al-jasus (the spy) is a person who spies for matters then returns with their news. He is the possessor of evil secrets, whereas al-namus (the confidant) is the possessor of good secrets.
- Tajassus technically: It is searching for private matters and faults, exposing what the people have concealed.
- May Allah protect us.