Should I inform you that slandering, that is in fact a tale-carrying which creates dissension amongst people, (and) he (further) said: The person tells the truth until he is recorded as truthful, and lie tells a lie until lie is recorded as a liar.  

إِنَّ مُحَمَّدًا ﷺ قَالَ أَلاَ أُنَبِّئُكُمْ مَا الْعَضْهُ هِيَ النَّمِيمَةُ الْقَالَةُ بَيْنَ النَّاسِ وَإِنَّ مُحَمَّدًا ﷺ قَالَ إِنَّ الرَّجُلَ يَصْدُقُ حَتَّى يُكْتَبَ صِدِّيقًا وَيَكْذِبُ حَتَّى يُكْتَبَ كَذَّابًا