So where can we read about the Trinity in the Bible? Kevin DeYoung responds:
Although the word “Trinity” is famously absent from Scripture, the theology behind the word can be found in a surprising number of verses. For starters there are verses that speak of God’s oneness (Deut. 6:4; Isa. 44:6; 1 Tim. 1:17). Then there are the myriad of passages which demonstrate that God is Father (e.g., John 6:27, Titus 1:4). Next, we have the scores of texts which prove the deity of Jesus Christ, the Son—passages like John 1 (“the word was God”), John 8:58 (“before Abraham was born, I am”), Col. 2:9 (“in Christ all the fullness of Deity lives in bodily form”), Heb. 1:3 (“The Son is the radiance of God’s glory and the exact imprint of his being”), Tit. 2:13 (“our great God and Savior Jesus Christ”)-not to mention the explicit worship Christ willingly received from his disciples (Luke 24:52; John 20:28) and the charges of blasphemy leveled against him for making himself equal with God (Mark 2:7). Then we have similar texts which assume the deity of the Holy Spirit, calling Him an “eternal Spirit” (Heb. 9:14) and using “God” interchangeably with the “Holy Spirit” (1 Cor. 3:16 and 1 Cor. 6:19; Acts 5:3-4) without a second thought.
The shape of Trinitarian orthodoxy is finally rounded off by texts that hint at the plurality of persons in the Godhead (Gen. 1:1-3, 26; Psalm 2:7; Dan. 7), texts like 1 Cor. 8:6 which place Jesus Christ as Lord right in the middle of Jewish Shema, and dozens of texts that speak of the Father, Son, and Holy Spirit in the same breath, equating the three in rank, while assuming distinction of personhood (Matt. 28:19; Gal. 4:6; 1 Cor.12:4-6; 1 Peter 1:1-2; 2 Cor. 2:21-22; 13:14; Eph. 1:13-14; 2:18, 20-22; 3:14-17; 4:4-6; 5:18-20; 6:10-18).
The doctrine of the Trinity, as summarized in the seven statements earlier, is not a philosophical concoction by some over-zealous and over-intelligent early theologians, but one of the central planks of orthodoxy which can shown, explicitly or implicitly, from a multitude of biblical texts.