If you look within the Bible, you will not find the word “trinity” located within it, not even once. This does not mean, however, that the notion of the Trinity is not located within the Holy Scriptures.
There are a number of verses that tell us that the Godhead consists of three persons — Father, Son, and Spirit– and that these three persons are equally and fully God. These verses mention three persons so as to provide no doubt about the Godhead being a “unity” of “three” — from which the word “Trinity” comes.
Jesus mentions God in three persons as He prepares to ascend to Heaven. He meets with the disciples and tells them to go and preach the Gospel:
“Go therefore and make disciples of all the nations, baptizing them in the name of the Father and the Son and the Holy Spirit” (Matthew 28:19, NASB).
When the disciples baptize, they are to baptize in the names of all three persons (God the Father, God the Son, and God the Holy Spirit). There is no hierarchy of the three; instead, they are placed as equals here.
Jesus mentions both the Father and Spirit in the Gospel of John:
“I will ask the Father, and He will give you another Helper, that He may be with you forever; that is, the Spirit of truth, whom the world cannot receive, because it does not see Him or know Him, but you know Him because He abides with you and will be in you” (John 14:16-17).
Jesus refers to the Father, whose job it is to send the “Helper,” who will be with them eternally (“forever”).
He is referred to as “the Spirit of truth,” matching Jesus’ claim that He is “the truth” (John 14: 6).
Jesus says the world cannot receive the Spirit nor does the world know the Spirit, matching John’s claim about Jesus that “the world did not know Him” (John 1:10). Finally, the “Helper,” the “Spirit of truth,” is referred to as “He” — a third person pronoun ascribed only to people, not objects or forces.
John also acknowledges Jesus as the Son of God:
“Grace, mercy and peace will be with us, from God the Father and from Jesus Christ, the Son of the Father, in truth and love” (2 John 3).
If you read the Pauline epistles (Paul’s letters), you will find that Paul often mentions “God our Father and The Lord Jesus Christ” in many, if not all, of his letters (Romans 1:7; 1 Corinthians 1:3; 2 Cor. 1:2; Galatians 1:3; Ephesians 1:2; Philippians 1:2; 1 Thessalonians 1:1; 2 Thessalonians 1:2; 1 Timothy 1:2; Titus 1:4; Philemon 1:3).
While Paul does not greet the Spirit in his greetings to the churches, he talks of the Spirit all the time in his letters (see Romans and Galatians).
A good example of this is Galatians 5 and 6, where He talks about being led by the Spirit and walking in the Spirit. Paul, however, is more emphatic about the Spirit in 1 Corinthians 12, where He mentions that the Spirit “distributes to each one individually just as He wills” (1 Cor. 12:10).
Notice that Paul refers to the Spirit as “He,” demonstrating that He viewed the Spirit to be as much a person of the triune Godhead as he did the Father and the Son.
Peter’s greeting in 1 Peter mentions not only the three persons of the Trinity, but also their distinguishing roles as God:
“Peter, an apostle of Jesus Christ, to those who reside as aliens, scattered throughout Pontus, Galatia, Cappadocia, Asia, and Bithynia, who are chosen according to the foreknowledge of God the Father, by the sanctifying work of the Spirit, to obey Jesus Christ and be sprinkled with His blood: May grace and peace be yours in the fullest measure” (1 Peter 1-2).
Peter’s greeting says that God elects His children according to foreknowledge, while the Spirit sanctifies believers and the Son dies for mankind. The Spirit grows believers to increasingly obey Jesus Christ as they are led by the Holy Spirit. Peter’s greeting includes all three persons of the Trinity.
These passages have shown that, while the word “Trinity” is a philosophical term, the concept itself is theological — that is, it comes from the Bible, the Word of God.
For a detailed article and with all the bible verses listed on the page, check out, The Trinity – God – Jesus – Holy Spirit