‘Imran ibn Husayn (Radiyallahu `anhu) said, The Messenger of Allah (Sallallaahu `alayhi wa sallam) said,

“What do you say about fornication, drinking wine and theft?”

“Allah and His Messenger know best,”

we replied.

He stated,

“They are acts of outrage and there is punishment for them, but shall I tell you which is the greatest of the great wrong actions? Associating with Allah Almighty and disobeying parents.”

He had been reclining, but then he sat up and said,

“and lying.”

Taken from Al-Adab al-Mufrad – by, Imam Al-Bukhari