سورة النحل

Ali ibn Ibrahim (may Allah have mercy on him): وَلاَ تَقُولُواْ لِمَا تَصِفُ أَلْسِنَتُکُمُ الْکَذِبَ هَذَا حَلاَلٌ وَهَذَا حَرَامٌ لِّتَفْتَرُواْ عَلَی اللهِ الْکَذِبَ [And do not say concerning that which your tongues describe falsely: "This is lawful and this is forbidden," so as to invent a lie against Allah] — this refers to the saying of the Jews: "What is in the wombs of these livestock is exclusively for our males and forbidden to our wives" (al-An'am/139).

Imam Sadiq (peace be upon him): Ishaq ibn Musa said: My brother and my uncle narrated from Imam Sadiq (peace be upon him): There are three gatherings which Allah despises and upon whose people He sends His punishment, so do not sit with them or keep company with them: a gathering in which there is someone who speaks falsehood in his fatwa [religious ruling]; a gathering in which the mention of our enemies is fresh and new while the mention of us is worn out; and a gathering in which there is someone who turns [people] away from following us, and you know that he is such a person. Then Imam Sadiq (peace be upon him) recited three verses from the Book of Allah as though they were in his palm: "Do not revile those whom they invoke besides Allah, lest they revile Allah out of enmity, without knowledge" (al-An'am/108); "And when you see those who engage [mockingly] in Our verses, turn away from them until they engage in some other talk" (al-An'am/68); and وَ لا تَقُولُوا لِما تَصِفُ أَلْسِنَتُکُمُ الْکَذِبَ هذا حَلالٌ وَ هذا حَرامٌ لِتَفْتَرُوا عَلَی اللهِ الْکَذِبَ [And do not say concerning that which your tongues describe falsely: "This is lawful and this is forbidden," so as to invent a lie against Allah].

Imam Sadiq (peace be upon him): When a servant commits a major sin from among the major sins, or a minor sin from among the minor sins which Allah has forbidden, he departs from iman (faith), but he remains within the circle of Islam and is still called a Muslim. If he repents and seeks forgiveness, he returns to iman [and in no case does he become a disbeliever]. The only thing that takes a person out of Islam and enters him into disbelief is defiance and declaring Allah's forbidden things permissible, and to say that a certain thing Allah has made lawful is unlawful and to persist in this belief. Such a person, in our view, has moved from Islam and iman into disbelief. The example of such a person is like one who enters al-Masjid al-Haram and the Ka'bah and commits a sin and impurity within it, then leaves, exiting Makkah and the Haram; his ruling is that his neck be struck and he shall go to Hell.

The Prophet (peace be upon him and his family): Whoever interprets the Quran by his own opinion has fabricated a lie against Allah.