With respect when Jesus talked about the Scriptures to the Jews he was telling them even though they knew their life was dependent on Scriptures they did not have it wrote in their hearts as if they did they would have known Jesus was the Messiah.
What purpose would Paul , Titus, Timothy or the other Apostles have in reading and teaching the OT to the Jews (they knew it but didn’t have it in them (hearts) or to the gentiles, when teaching them about Jesus and his teachings, calvary, and resurrection.
They may have referred to a few verses in the OT to show how Jesus was the Messiah, but they taught from new material besides the OT.
oh dear, maybe this excerpt can answer that for you
Paul Observed the Old Testament’s Teachings
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Let’s look at some instances of direct reliance on the Old Testament by believers living in the early New Testament era.
When Paul commended the New Testament Bereans for diligently searching the scriptures to see whether what he was preaching to them was true (Acts 17:11), he referred to their study of what we call the Old Testament: “These were more noble than those in Thessalonica, in that they received the Word with all readiness of mind, and searched the scriptures daily, whether those things were so.”
But to them it was not the “Old Testament.” As far as the Bereans were concerned, they were merely searching Yahweh’s Word, which included the Law, the Psalms, and the Prophets, to confirm that what they were hearing from the New Testament apostles was true.
Remember, the Old Testament was the only Bible they had. It was the foundation of their faith and belief, and Paul even applauded them for double-checking with the Old Testament first before believing anything they read in the New Testament writings!
All of which screams one especially important fact: the New Testament does not contradict the Old Testament.
Why did not Paul say, “Listen people, don’t bother with those old writings that are now out of date. Just read my letters and do what they say and forget that Old Testament. I am all the Bible you need now.” He knew that teaching such a thing, which churches everywhere do believe and teach today, would be an enormous falsehood. He himself based Truth on the Old Testament Scriptures.
Note how Paul supported and taught the law and the Old Testament:
• In Acts 24:14 Paul adamantly confirmed that he believed “all things which are written in the law and in the prophets” (Old Testament).
• To prove that he lived “in observance of the law,” Paul agreed to undertake a ritual purification at the temple, at which time he proved that he kept the law (Acts 21:24-26).* Born a Benjaminite, he was instructed by Gamaliel “according to the perfect manner of the law,” Acts 22:3.
• In diametric opposition to what most clerics teach today, Paul said he was not against Old Testament teachings and did nothing to violate them, Acts 28:17.
• As a matter of fact, Paul taught the people about Yahshua from morning to night “out of the law of Moses and out of the prophets,” (Old Testament) Acts 28:23.
• In Acts 25:8 Paul maintained that he never broke any laws of the Jews or the temple.
All the books of the Old Testament except Esther, Ecclesiastes and the Song of Solomon are quoted in the New Testament.
That Old Testament that is used only occasionally for a children’s Bible lesson or for reading of an infrequent Psalm or Proverb is a lot more important than most people think. Yahshua, the apostles, and the earliest converts relied on the Old Testament as the basis for their teachings. They constantly alluded to it and defined their faith in light of what it said.
Once you have all the facts, then you are prepared to make informed, correct choices. People urgently need this truth about the Old Testament so that their worship can be corrected and aligned with the same Truth the prophets, Apostles, and Yahshua the Messiah followed. Sadly, most don’t want the truth of the matter. They love darkness rather than light (John 3:19) for fear of what they might discover that could alter their beliefs and impact their lifestyle. They are comfortable and satisfied in their traditional beliefs no matter how erroneous.
taken from:
yrm.org/old%20testament%20lives.htm