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Surah 33. Al-Ahzab
Ayah 57 - 58
٥٧. إِنَّ ٱلَّذِينَ يُؤْذُونَ ٱللَّهَ وَرَسُولَهُۥ لَعَنَهُمُ ٱللَّهُ فِى ٱلدُّنْيَا وَٱلْـَٔاخِرَةِ وَأَعَدَّ لَهُمْ عَذَابًا مُّهِينًا
٥٨. وَٱلَّذِينَ يُؤْذُونَ ٱلْمُؤْمِنِينَ وَٱلْمُؤْمِنَـٰتِ بِغَيْرِ مَا ٱكْتَسَبُوا۟ فَقَدِ ٱحْتَمَلُوا۟ بُهْتَـٰنًا وَإِثْمًا مُّبِينًا
[57-58] Allah has cursed in this world and in the Hereafter those who cause trouble to Allah and His Messenger, and has prepared for them a disgraceful punishment.108 And those who cause trouble to the believing men and women for no fault of theirs, have indeed born on their head the burden of a grave slander109 and a manifest sin.
108"To trouble Allah" implies two things: That Allah should be disobeyed, that an attitude of disbelief and shirk and atheism be adopted with regard to Him, and that things made unlawful by Him be made lawful; and (2) that His Messenger be troubled, for just as obedience to the Messenger is obedience to Allah, so is opposition and disobedience of the Messenger opposition and disobedience of Allah.
109This verse determines the definition of slander. It is to ascribe a fault to a person which he does not have, or an error which he has not committed. The Holy Prophet also has explained it. According to Abu Da'ud and Tirmidhi, when he was asked as to what is ghibat (backbiting), he replied: 'It is to make mention of your brother in a manner derogatory to him. " The questioner said, "And if the fault is there in my brother?" . The Holy Prophet replied: `If the fault that you mentioned is there in him, you backbite him; if it is not there, you slandered him." Such an act is not only a moral sin, which will entail punishment in the Hereafter, but this verse also requires that in the law of an Islamic State also false allegation should be held as a culpable offense.