Walter Veith on why 1 John 5:7 is omitted from Modern Bibles.

The translators of the King James Version saw fit to include 1 John 5:7, which reads:
"For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one." 1 John 5:7
Modern Bible translations, which are based on the manuscripts of "protestants" Wescott and Hort, remove the majority of this verse. These two fellows adored Mary and held communion with spirits of the dead while claiming to be protestants.
"God is one. Jesus Christ is one. The Holy Spirit is one. And these three are one: there is no dissent nor division among them." -Alonzo Trevier Jones 1899
Original video: • Video