(3) In the fourth century C.E., in a Latin treatise, an overzealous advocate of Trinitarianism evidently included the words “in heaven, the Father, the Word, and the holy spirit; and these three are one” as if these were a quotation from 1 John 5:7. Later that passage was put right into the text of a Latin Bible manuscript.

As for the interpolations at 1 John 5:7 to support the Trinity and at Acts 13:2 to justify the Mass, these did not change what is truth. And in time the frauds were fully exposed.