Al-Quran: on Halal and Haram...

So eat any lawful, wholesome thing God has provided you with, and be thankful for God's favor if you have been worshipping Him. He has only forbidden you carrion {dead animals}, blood, and pork, as well as anything that has been consecrated to something besides God. Yet anyone who is obliged to do so without desiring it nor going to excess [will find] God is Forgiving, Merciful.

Surah An-Nahl (16:115) - Translations by T.B. Irving

{...} is my own addition.

Do not tell a lie about something your tongues describe (such as): "This is lawful, while this is forbidden!"; so that you fabricate a lie against God. Those who fabricate a lie about God will not prosper: [they will have] slight enjoyment, and they shall [then] have painful punishment.

Surah An-Nahl (16:116-117) - Translations by T.B. Irving

My own comment: these ayats don't only apply to those who make the forbidden things halal, but also those who forbid things that are halal. Wallah hu'alam.