Well, we can start with Jesus Himself. HE continually referenced Scripture and used it to validate Himself.
There are also Paul and Peter. Pillars of the church, no?
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2 Timothy 3
10 You, however, have followed my teaching, my conduct, my aim in life, my faith, my patience, my love, my steadfastness, 11my persecutions and sufferings that happened to me at Antioch, at Iconium, and at Lystra—which persecutions I endured; yet from them all the Lord rescued me. 12Indeed, all who desire to live a godly life in Christ Jesus will be persecuted, 13while evil people and impostors will go on from bad to worse, deceiving and being deceived. 14But as for you, continue in what you have learned and have firmly believed, knowing from whom you learned it 15and how from childhood you have been acquainted with the sacred writings, which are able to make you wise for salvation through faith in Christ Jesus. 16 All Scripture is breathed out by God and profitable for teaching, for reproof, for correction, and for training in righteousness, 17that the man of God may be competent, equipped for every good work.
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2 Peter 3:15-17
15And count the patience of our Lord as salvation, just as our beloved brother Paul also wrote to you according to the wisdom given him, 16as he does in all his letters when he speaks in them of these matters. There are some things in them that are hard to understand, which the ignorant and unstable twist to their own destruction, as they do the other Scriptures. 17You therefore, beloved, knowing this beforehand, take care that you are not carried away with the error of lawless people and lose your own stability.
Don't tell me you think Christ, God, needed to validate Himself? You believe that that is why Christ quoted the Septuagint?
You know, mm, I have for sometime now been suspicious that some Protestant theology is strangely Mohammedan. That's precisely how Mohammedan used both the OT and his own scriptural nonsense. The Mohammedans reduce Christ to the next to the greatest prophet. Do you reduce Him to a mere prophet who needs validation by scripture?. If you don't mean that, you should be more careful about what you say. Think it through.
That is most interesting, considering that a learned and observant Jew, such as Jesus, would have never done that! Rather than the Written Torah, he would have referred to the Oral Torah.
"Christians are like the heathen in this tractate. They want to accept the Written Torah that was packaged into their Christian Bible, but yet they reject the entire historical context that surrounds it. And we all know that something can’t be understood outside of its context." [Oral Torah]
There are numerous examples why this is so. Of course, the Christian books were written by Christians activists who, in order to promote their own interpretation of the Torah that would be "harmonized" with the New Testament, also promoted the idea that the Oral Torah was a Jewish invention.
Since Christ was or would not have been a Sadducee, he would have accepted the Oral Torah, lake the rest, rather than appeal to the Written Torah or the writings (scriptures) to "validate" himself. In other words, the Gospels and the NT were written for a specific consumption, mostly Greeks and Romans, who knew little or nothing of Judaism.