Surah An Nahl Tafseer

وَلَا تَقُولُواْ لِمَا تَصِفُ أَلْسِنَتُكُمُ الْكَذِبَ هَـذَا حَلَلٌ وَهَـذَا حَرَامٌ لِّتَفْتَرُواْ عَلَى اللّهِ الْكَذِبَ

And do not describe what your tongues have lied about, saying:"This is lawful and this is forbidden," to invent lies against Allah.

This includes everyone who comes up with an innovation (Bid`ah) for which he has no evidence from the Shariah, or whoever declares something lawful that Allah has forbidden, or whoever declares something unlawful that Allah has permitted, only because it suits his opinions or whim to do so.

لِمَا تَصِفُ

(describe what...),

meaning, do not speak lies because of what your tongues put forth.

Then Allah warns against that by saying:

إِنَّ الَّذِينَ يَفْتَرُونَ عَلَى اللّهِ الْكَذِبَ لَا يُفْلِحُونَ

Verily, those who invent lies against Allah, will never succeed.

meaning, either in this world or the Hereafter.

مَتَاعٌ قَلِيلٌ وَلَهُمْ عَذَابٌ أَلِيمٌ