In Mark 7:67, Jesus quotes the LXX of Isaiah 29:13 when he says, "Well did Isaiah prophesy of you hypocrites, as it is written, This people honors me with their lips, but their heart is far from me; in vain do they worship me, teaching as doctrines the precepts of men."
What proof do you have that the 'LXX' was not written by Origen or Eusebius and thus copied from the scriptures as opposed to the scriptures being copied from the LXX???
What proof do you have it wasn’t?