"Then woe to those who write the book with their own hands and then say: 'This is from Allah', to traffic with it for a miserable price. Woe to them for what their hands do write and for the gain they make thereby"

The noble Qur'an Al-Bakarah(2):79
 

"And when there came to them a messenger from Allah, Confirming what was with them, a party of the people of the book threw away the book of Allah behind their backs as if (it had been something) they did not know"

The noble Qur'an Al-Bakarah(2):101
 

"Ye shall not add unto the word which I (God) command you, neither shall ye diminish [ought] from it, that ye may keep the commandments of the LORD your God which I command you."

Deuteronomy 4:2