The people of the BOOK are admonished here for tampering with truth and clothing it with falsehood for preventing the access of people to it: ``O, People of the BOOK! why do you disbelieve in Allah's signs, and work against the light which you, yourselves are witnesses of it - And why do you clothe and cover the truth with falsehood, and conceal the truth while you know!?''
Those jealous Jews, had the signs and symptoms of the promised prophet in their scriptures, but concealed the facts and did not allow the virtues and credentials of Mohammad to be known. By doing that on purpose, they ruined their souls, and descended to the lowest of degradation.