Falsehood against Allah (S.w.T.), the Prophet (S) and the Imams (a.s.)
The worst kind of falsehood is what one utters against Allah (S.w.T.) the Almighty, His Prophet (S) and the Imams (a.s.). The divine book, Qur’an says:
“And, for what your tongues describe, do not utter the lie, (saying) this is lawful and this is unlawful, in order to forge a lie against Allah; surely those who forge a lie against Allah shall not prosper. A little enjoyment and they shall have a painful punishment.”
(Surah an-Nahl 16:116-117)
The sixth holy Imam, Imam as-Sadiq (a.s.) says:
“To attribute falsehood to Allah and this Holy Prophet (S) is the greatest sin.”
(al-KÄfi)
Imam Ja’far as-Sadiq (a.s.) also told Abu Noman:
“Do not attribute falsehood to us. Such a lie will expel you from the upright faith (Islam).”
(al-KÄfi)
This means that even if a single falsehood is attributed to the Imams (a.s.) the light of faith is extinguished from the heart. It is such a serious sin that if one intentionally commits it during the fast of Ramzan, his fast is invalidated.