In the Bible, God is revealed and described with such attributes as: eternal, omnipresent, omnipotent, omniscient, perfect, and the like.

Also, the doctrine of Trinity is taught in the Bible; that is, God eternally existing as three co-equal Persons (Father, Son, and Holy Spirit), yet as one God.

Although the term trinity is not found in the Bible, it certainly represents a biblical theme and revelation that runs throughout the Bible. The term summarizes the teaching of Scripture that God is three Persons yet one God.

The concept of triune God is not foreign in the Old Testament Scriptures. There several passages that highlight this doctrine; the following represent few examples.

“Let us make man in our image, after our likeness.” Gen. 1:26 (Mark the plural pronouns).

“The man has now become like one of us, knowing good and evil….” (Gen. 3:22)

“Come, let us go down and confuse their language so they will not understand each other.” (Gen. 11:7)

“Then I heard the voice of the Lord saying, ‘Whom shall I send? And who will go for us?’” (Isa. 6:8).

Further, there are OT passages where one person is called “God” or “Lord” and is distinguished from another person who is also said to be God (Ps. 45:6-7; 110:1. cf. Matt. 22:41-46; Prov. 8:22-31; Isa. 48:16; 63:10. Mal. 3:1-2). It shows that the Bible authors seemed to be much aware of the plurality of Persons in one God.

In the New Testament, we see a complete revelation of the Trinity. The incarnation of Jesus (the Son) was for the purpose of revelation of the Father. In several passages the three Persons of the Trinity are named together (Matt. 3:16-17; 28:19; 2 Cor. 13:14; 1 Pet. 1:2; Jude 20-21; 1 Jn. 5:7).

Summary of Biblical Teaching on the doctrine of Trinity

1. God is three persons– They are distinct persons and work together without confusion (Jn. 1:1-2; 14:26; 16:7).
2. Each person is fully God– They are co-equal and eternal.
3. There is one God-There is one and only one God. The three Persons are one not just in functions, but also one in essence. There are no three Gods. There is only one God. Deuteronomy 6:4-5 reads, “Hear, O Israel, the Lord our God, the Lord is one. Love the Lord your God with all your heart and with all your soul and with all your strength.” This is a clear affirmation and declaration of the oneness of God. The following verses also attest the same truth: Exodus 15:11; 1 Kings 8:60; Isa. 45:21-22; 44:6-8; Rom. 3:30; 8:27-29; 1 Cor. 8:6; Eph. 4:3-6; 1 Tim 2:5. Jas 2:19.

There is a perfect functioning relationship within the Godhead and no conflict at all in respect to how they work: The one who sent me is with me; he has not left me alone, for I always do what pleases him (Jn. 8:29). The Father sends the Son yet remains with him. The Son represents the Father and obeys him willingly. The Holy Spirit brings to completion the work that has been planned by God the Father and carried out through the incarnation of God the Son.