Another reason is the falsehood that EVERYTHING was nailed to the cross. A more thorough reading of teachings in the new testament in the Greek would be very beneficial. In the old testament see the Hebrew words for “throughout your generations” and “forever” in reference to how long we are
To keep Yahovah God’s commandments.
Even better, have an excellent English translation of the OT.
Or because we live in the “new covanent times” and the OT represents the old covanent.