عَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ يَقُولُ مَنْ شَهِدَ عَلَى مُسْلِمٍ شَهَادَةً لَيْسَ لَهَا بِأَهْلٍ فَلْيَتَبَوَّأْ مَقْعَدَهُ مِنَ النَّارِ
Narrated by Sayyiduna Abu Huraira (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: Whoever gives such testimony against a Muslim for which that Muslim is not deserving, then such a person should prepare his abode in Hell.