what do you think "unparalleled" means? It's a relative term.
In terms of consistency in textual error, the dead sea scrolls were found to be almost identical with all previously known ancient manuscripts.
In terms of internal narrative consistency, the new testament (written centuries after the books of Moses) is completely accurate in all it's references to the old testament as history and as doctrine. There is no inconsistency between what was taught in the OT and in the NT, besides what is deliberately altered upon the introduction of the new covenant (like food prohibitions).
Here's a famous example: Jesus was the sacrifice for the sins of the world. In this way, he was the lamb of God, being typologically related to the literal sacrificial lambs of the Old Testament. At the crucifixion, the Romans would have broken the legs of Jesus so that he would die, but they pierced his side and discovered he was already dead, no bone breaking needed. This was for consistency with what the OT said would happen in Psalm 34.
<34 But one of the soldiers pierced His side with a spear, and immediately blood and water came out. 35 And he who has seen has testified, and his testimony is true; and he knows that he is telling the truth, so that you also may believe. 36 For these things came to pass to fulfill the Scripture, “Not a bone of Him shall be [p]broken.” 37 And again another Scripture says, “They shall look on Him whom they pierced.”