Jabir Bin ‘Abdullah narrated that when Umar came to Allah’s Messenger (s.a.w.), he said: “We hear the narration from the Jews, which sounds pleasing to us, so should we not write some of them?” Whereupon he (s.a.w.) said: “Do you want to be baffled as the Jews and the Christians were baffled? I have brought to you (guidance) bright and pure and if Moses were alive now there would have been no alternative left for him but to follow me.” (Tirmidhi 177)
Jabir Bin ‘Abdullah narrated that Umar Bin al-Khattab brought to Allah’s Messenger (s.a.w.) a copy of the Torah and said: “Allah’s Messenger (s.a.w.), this is a copy of the Torah.” He (Allah’s Messenger (s.a.w.) kept quiet and he (Umar) began to read it. The (color) of the face of Allah’s Messenger (s.a.w.) underwent a change. Abu Bakr said, “Would that your mother mourns you, don’t you see the face of Allah’s Messenger?” Umar saw the face of Allah’s Messenger (s.a.w.) and said, “I seek refuge with Allah from the wrath of Allah and the wrath of His Messenger (s.a.w.). We are well pleased with Allah as Rabb, with Islam as religion, and with Muhammad (s.a.w.) as Prophet.” Whereupon Allah’s Messenger (s.a.w.) said: “By Him in Whose hand is the life of Muhammad, even if Moses were to appear before you and you were to follow him, leaving me aside, you would certainly stray into error. If (Moses) were alive (now), and he found my prophethood, he would have definitely followed me.” (Tirmidhi 194, Darimi and Mishkat 1/20)
[Not so sure about the authenticity of this Hadith. There's a more reliable similar one that I couldn't find.]
The Prophet SAWS frowned upon those who read the previous books. The Qur'an is meant as the final word of Allah, overriding the previous scriptures. While they are not worthless, they rank quite poorly.