Sahih al-Bukhari 110
Sahih al-Bukhari · Book 3: Knowledge · The sin of a person who tells a lie against the Prophet (saws)
Narrated Abu Huraira:
حَدَّثَنَا مُوسَى ، قَالَ حَدَّثَنَا أَبُو عَوَانَةَ ، عَنْ أَبِي حَصِينٍ ، عَنْ أَبِي صَالِحٍ ، عَنْ أَبِي هُرَيْرَةَ ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " تَسَمَّوْا بِاسْمِي وَلاَ تَكْتَنُوا بِكُنْيَتِي، وَمَنْ رَآنِي فِي الْمَنَامِ فَقَدْ رَآنِي، فَإِنَّ الشَّيْطَانَ لاَ يَتَمَثَّلُ فِي صُورَتِي، وَمَنْ كَذَبَ عَلَىَّ مُتَعَمِّدًا فَلْيَتَبَوَّأْ مَقْعَدَهُ مِنَ النَّارِ " .
The Prophet (ﷺ) said, "Name yourselves with my name (use my name) but do not name yourselves with my Kunya name (i.e. Abul Qasim). And whoever sees me in a dream then surely he has seen me for Satan cannot impersonate me. And whoever tells a lie against me (intentionally), then (surely) let him occupy his seat in Hell-fire."