The Table Spread - 5:44 We sent down the Torah in which is guidance and light, and the Muslim prophets used to judge between the Jews by it. And the rabbis and the scribes used to judge by what they were commanded from the Book of Allah, and they were witnesses over it. Do not honor the people, honor Me, and do not sell My verses at a cheap price. Those who do not judge by what Allah has revealed are disbelievers.
Our Lord's judgment on those who conceal/change something from the Book:
The Cow/2:174 Those who conceal something from the Book which Allah has sent down and exchange it for a little, they are stuffing fire in their bellies. Allah will not speak to them on the Day of Resurrection nor purify them. For them is a painful torment.
The Cow/2:175 They have bought error for guidance and torment for forgiveness. How resistant they are to the fire!
The Cow/2:159 Those who conceal the clear proofs and guidance which We have sent down - after We have made it public in the Book - are cursed by Allah and all those who curse.