According to the consensus of classical Islamic scholarship, the act of falsely declaring things 'lawful' (Halal) or 'unlawful' (Haram) is a grave sin explicitly condemned in the Quran. The central evidence, Surah An-Nahl verse 116, states, 'And do not say about what your tongues assert of untruth, “This is lawful and this is unlawful,” to invent falsehood about Allah.' Ibn Kathir explains this includes anyone who introduces a religious innovation (Bid'ah) without evidence from the Shari'ah. This prohibition establishes a foundational principle of Islamic theology: the exclusive right to legislate belongs to Allah alone (Hakimiyyah). Al-Qurtubi's analysis of the verse highlights that this was a practice of pre-Islamic Arabs who forbade things based on superstition, but the ruling is timeless and universal. To invent such rulings is not merely a mistake but a deliberate 'lie against Allah' (Iftira'), which the Quran warns will lead to failure and a painful punishment. Therefore, Islamic jurisprudence is built on the principle that all things are permissible by default, except what is explicitly forbidden by a divine text.