Salam to all
THE JEWS JUDGED BY THE TORAH
005.043
But why do they come to you for decision, when they have (their own) Torah before them? therein is the (plain) command of God; yet even after that, they would turn away. For they are not People of Faith.
at the point of revelation to Prophet Muhammad, (pbuh) the Torah and particularly the Gospels had already undergone canonisation, the council of Nicaea had already convened in 325 AD under Constantine (nearly 300 years earlier), some Gospels had already been assigned an Apocrypha status and the Jewish Tanakh and Talmud had already been canonized as well as the orthodox Gospels.
Despite this, the Quran's focus still remains on what the Christian and Jewish Arabs, during Muhammad's (pbuh) ministry were reading and believed. These people were part of the primary audience that the Quran was addressing. The immediate focus group was not all of Christendom or the Jewish followers throughout the world in a state of Diaspora, but the immediate contemporaries of the Prophet and what knowledge (scriptures et al) was with them
THE CHRISTIANS JUDGED BY THEIR OWN GOSPELS
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"And in their footsteps We sent Jesus the son of Mary, confirming the Torah that had come before him (Arabic: Bayna yadayhi) : We sent him the Gospel: in it was guidance and light, and confirmation of the Torah that had come before him: a guidance and an admonition to those who fear God."
005.047
"Let the people of the Gospel judge by what God has revealed in it. If any do fail to judge by (the light of) what God has revealed, they are those who rebel (Arabic: Fasiquna)."
By the time of Prophet Muhammad (pbuh) (Late 6th early 7th century), parts of the Bible had already undergone changes and a creed had developed (The Council of Nicaea congregated in 325AD). The Quran however, is still clearly recognising the text that lay with them.