The concept of the Trinity—that God is one being in three persons (Father, Son, and Holy Spirit)—is a central doctrine in most branches of Christianity, but it is important to note that the word “Trinity” itself does not appear in the Bible. The development of this doctrine was the result of theological reflection on the biblical texts and was formalized in the early creeds of the Christian Church. The key passages from the Bible that Christian scholars often cite as indicative of the Trinitarian nature of God are in the following.  According to Matthew 28:19 , this verse records the Great Commission, where Jesus instructs His disciples, saying, “Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit.” This passage is often cited because it groups the Father, Son, and Holy Spirit together in a way that implies equality and unity. According to 2 Corinthians 13:14 , known as the benediction, this verse says, “The grace of the Lord Jesus Christ and the love of God and the fellowship of the Holy Spirit be with you all.” Again, this is significant for Trinitarian doctrine because it places the three persons together in a formulaic blessing. According to John 1:1-14, in the opening of the Gospel of John, Jesus is described as the Word who was with God and was God, and later, the Word became flesh. This passage supports the idea of Jesus’ divinity and distinct personhood but also His unity with the Father. According to John 14:16-17, Jesus promises to send another Helper, the Spirit of truth (the Holy Spirit), who will dwell with and be in the disciples. This passage not only differentiates the persons but also speaks to the Holy Spirit’s divine role and presence. According to Genesis 1:26, in the creation account, God says, “Let us make man in our image, after our likeness.” The use of plural pronouns has been interpreted by some scholars as a suggestion of the plural aspects of God’s nature, which can be seen as a hint of the Trinity. According to John 10:30, Jesus says, “I and the Father are one,” which has been interpreted as a statement of unity and equality with God the Father, supporting the concept of the Trinity.  These passages, among others, are used by Christian theologians to argue for the Trinitarian understanding of God. The doctrine was further developed and defined through the ecumenical councils, beginning with the First Council of Nicaea in 325 AD, which addressed the divinity of the Son, and the Council of Constantinople in 381 AD, which affirmed the divinity of the Holy Spirit.