The Prophet ﷺ said:
مَنْ كَذَبَ عَلَيَّ مُتَعَمِّدًا فَلْيَتَبَوَّأْ مَقْعَدَهُ مِنَ النَّارِ (Sahih Muslim, Introduction: 3)
Translation: Whoever deliberately lies about me, let him take his place in the Fire.
This is an example of mutawātir Hadith. The description concerns the many narrators who transmitted it, not simply the severity of its warning.