Gregory of Nazianzus sets this forth as official terminology:
God the Father, God the Son, and God the Holy Ghost, Three Persons, One Godhead, undivided in honour and glory and substance and kingdom (Theological Orations V.28).
However, I don’t see such a statement anywhere in the New Testament. I don’t even see the words “three persons” anywhere. Why would the Bible have to wait some three hundred years for Gregory of Nazianzus to set the record straight? Weren’t the NT writers inspired?
Maybe Gregory of NaZianzus got it wrong. Why would the Bible need to be set straight in the first place.
Rev 22 18-19
18 For I testify unto every man that heareth the words of the prophecy of this book, If any man shall add unto these things, God shall add unto him the plagues that are written in this book:
19 And if any man shall take away from the words of the book of this prophecy, God shall take away his part out of the book of life, and out of the holy city, and [from] the things which are written in this book.
Christ in the New Testament tells the disciples and apostles to go forth to all the world, “baptizing them in the name of the Father, and of the Son and of the Holy Spirit.”
Is that enough scripture for everyone?