Verily, in the presence of the Last Hour,... there will be false testimony and concealing evidence. (Ahmad Diya ad-Din al-Kamushkhanawi, Ramuz al-Ahadith, 1/121)
The spread of false accusation is one of the portents of the Day of Reckoning. (Ash-Sharani, Mukhtasar Tazkirah al-Qurtubi, p. 450)