It is true the term “trinity” is not used in the Bible. However, there are multiple references to THE Father, THE Son and THE Holy Spirit.
“All authority in heaven and on earth has been given to me. Therefore go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit [Matthew 28:19].”
“May the grace of the Lord Jesus Christ, and the love of God, and the fellowship of the Holy Spirit be with you all [2 Corinthians 13:14].”
“To Gods elect. . .who have been chosen according to the foreknowledge of God the Father, through the sanctifying work of the Spirit, for obedience to Jesus Christ and sprinkling by his blood [1 Peter 1:1-2].”
"Go ye therefore, and teach all nations, Go, and make disciples of all the nations in My Name, teaching them to observe all things whatsoever I have commanded you, [[Matt. xxviii. 19.]] From Proof of the Gospel (the Demonstratio) by Eusebius. Eusebius (265-339 CE) Bishop of Caesarea around 314 CE Book III, Chapter 7, 136 (a-d), p. 157 http://www.ccel.org/ccel/pearse/morefathers/files/eusebius_de_05_book3.htm
also
In ~311 CE Eusebius (265-339) Bishop of Caesarea Apparently Matthew 28:19 was changed
shalom b'SHEM Yah'shua HaMashiach baptizing them in the name of the Father, and of the Son, and of the Holy Ghost." Matthew 28:19 KJV
(2) Book III, Chapter 6, 132 (a), p. 152
(3) Book III, Chapter 7, 138 (c), p. 159
(4) Book IX, Chapter 11, 445 (c), p. 175
(5) Book I, Chapter 3, 6 (a), p. 20
(6) Book I, Chapter 5, 9 (a), p. 24
In his _Proof of the Gospels_
in Book three chapter seven states Go, and make disciples of all the nations in My Name, teaching them to observe all things whatsoever I have commanded you, [[Matt. xxviii. 19.]]
http://www.ccel.org/ccel/pearse/morefathers/files/eusebius_de_05_book3.htm
after Eusebius wrote his Proof of the Gospel.
Just to add to this - all three were present when Christ was baptized.
And not ONCE are any of them EVER called a PERSONAGE!!!
And I gave a longer list of these type of trinitarian passages from most of the New Testament contributors in the last half of post #238.