Meaning, a thing may be established at the mouth of 2 or 3 witnesses, & the Word Himself, Jesus supported that idea. Deuteronomy 17:6 and 19:15 give the 2 other witnesses by the way, but the context is about "how to establish truth". Let’s check a few Bible verses that I researched using Biblegateway.com to show why the King James Version is more than just a preference.
Daniel 3:25 – The pre-existence of Jesus is evidenced by the 1 who looks like the Son of God (not says son of the gods).
Revelation 13:8 – Jesus was sent to be slain by a plan that was made before Earth even existed, but most Bibles twist this verse away from the pre-existence of Jesus (because that would make Him God). See all except NIV.
Ephesians 3:9 – Avoid Bibles that resist that Jesus is truly had a hand in creation, because the Creator is the synonymous with God. Compare & contrast.
Proverbs 8:22 – Watch out for Bibles that try to make Jesus a created man & not the Creator, especially footnotes in the margin (in italics). See all except NASB.
Mark 16:9-20 – To make us doubt Jesus’ resurrection, check if these verses only appear in footnotes, in brackets, or in margins.
Job 19:26 – The hidden agenda is to reject the idea of resurrection of the dead, so instead of Job seeing God in his flesh, it is italicized in the margin to create doubt…as if Job will be a ghost when he sees God. (sigh)
John 9:4 - The hidden agenda is the idea that Jesus was not sent from God to work for us, & since we are 1 with the Universe, we can work on our own behalf....saved by our own works. Sneaky.
John 5:39 - The hidden agenda undermine the authority in Jesus' ability to command...to a simple statement about what they already do. Smh.