They desire to extinguish li-yutfi’ū is in the subjunctive form because of an implicit an sc. an yutfi’ū the lām being extra the light of God His Law and His proofs with their mouths with their sayings that this is sorcery or poetry or soothsaying; but God will perfect He will manifest His light mutimmun nūrahu some have read this in the form of a genitive annextation mutimmu nūrihi though the disbelievers be averse to this.