Narrated `Ali: The Prophet said, "Do not tell a lie against me for whoever tells a lie against me (intentionally) then he will surely enter the Hell-fire."
Hadith ReferenceSahih Bukhari / The Book of Knowledge / Hadith: 106
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة