But you already had a freudian slip and admitted they plagiarized & not just included the OT.
Proof and admission of Plagiarizing:
1)in John Apochrypha they admit plagiarizing and borrowing from Zoroastrianism.
2)NT admits their intent to fit him in texts
Luke 24:44-45 "Then he said to them, 'everything must be fulfilled that is written about me in the law of Moses, the prophets and the psalms.'
(-Meaning, fit me in every verse to make me out to be the one)
Thus They rewrote Matthew 1.1 through 4:11 to create his Genesis (Luke 1:5 - 4:13). He leaned on Mark 1:21 through 3:19 to create his Exodus (Luke 4:14 - 6:19).
They quarried Matthew in rather unique ways to develop his readings for Leviticus (Luke 6:20 - 8:25). He transcribed Mark 4 through 9 with some rather gaping omissions to provide appropriate readings to correspond with the material found in Numbers (Luke 8:26 - 9:50). Finally, in their most imaginative piece of writing, Luke created the expanded journey section of his gospel (Luke 9:51 - 18:14) to correspond to the readings from Deuteronomy.
In order to show Jesus as the fulfillment of the Torah, Luke wrote his infancy story against
the background of
the Book of Genesis.=PLAGIARISM
The blood atonement borrowed from Deut 21.
Jeremiah 13:13-14 was used in emulating out of it's context of time and message to create a disturbing threat in Matthew 10: 34-40 and Thomas Verse 16.
2Samuel 1:10 &1:12 was rewritten in the crucifixion scene of Jesus to be about him not Israel.
Even 1Sa 5:3 &5:4 mirrors his crucifixion that was written to emulate these verses about the Philistine deity "Dagon" he represents.
And read II Kings 4: 42 - 43(sound familiar to the loaves of bread story placed upon Jesus?)
="Plagiarism"
Not only did they rehash text that was already in the bible but they also manipulate text that their teachings are based on making excuses for not fulfilling things or for problems that arise like his death etc. All the stories are based on twisted reasoning trying to avoid the inevitable questions like how could God die and allow himself to be tortured by his enemies etc. So they wrote the story and religion around these complications and twisted reason and common sense to make excuses for these things.-oops epic fail!