I've always seen the OT as "The Bible: Part One" and the NT as "The Bible: Part Two".
The NT does not refute any of what is in the OT, nor does it advise that anything instructed in the OT should not be undertaken or believed by Christians. Indeed, in the NT, Jesus cites numerous parts of the OT, including Genesis 1:27 (as authoritative scripture), and quotes Leviticus 14:2-32, 1 Samuel 21:1-6, 2 Chronicles 24:20-21, Psalm 82:6 and Isaiah 61:1-2 among many others. The Apostle Paul quoted Exodus 20:12 when he wrote to the Ephesians and referred to Ezekiel 37:27 when he wrote to the Corinthians.
There are many, many occasions when parts of the OT are clearly referred to, alluded to or quoted in the NT.
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Disclaimer: As always, when I post on this subject, it is from the position of not believing in anything that was written in the OT or the NT, not believing in the reality of Historical Jesus as an individual. I merely address that which is written in the Bible in much the same way that a critic writes about the characters, events and places in a fictional book or movie.