Bukhari

Hadith Commentary:
To narrate a false dream is a greater sin than lying while awake, because dreams are a part of the branches of prophethood.
The one who narrates a false dream is, in effect, slandering Allah; the same applies to the one who narrates a fabricated hadith.
Whoever attributes a lie to the Messenger of Allah (sallallahu alayhi wa sallam)—if he does not repent—such a person is a living inhabitant of Hell.
Nowadays, many people falsely claim to be Shaykh, Sayyid, or Pathan; they should reflect upon this Prophetic instruction and realize how grave a sin this is.

Hadith Commentary:
Telling lies is a sin even in the state of wakefulness, but since the Messenger of Allah (sallallahu alayhi wa sallam) has declared a true dream to be the forty-sixth part of prophethood, the one who narrates a false dream, as if, seeks to cast doubt upon this part of prophethood as well—so this is a very great slander.
The same is the case with the one who narrates a fabricated hadith, who attributes to the Messenger of Allah (sallallahu alayhi wa sallam) something which he did not say.
If such a person does not repent, then he is a walking denizen of Hell in this world.
Apart from this, we observe that nowadays most people falsely claim to be Sayyid, Shaykh, Pathan, etc.; they too should reflect upon the aforementioned Prophetic instruction, as to how grave a crime it is to do so.