John 15:26 – 16:24
Matthew 28:1 – 20
Matthew 28:18–20 (NKJV)
18 And Jesus came and spoke to them, saying, “All authority has been given to Me in heaven and on earth. 19 Go therefore and make disciples of all the nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, 20 teaching them to observe all things that I have commanded you; and lo, I am with you always, even to the end of the age.” Amen.
2 Corinthians 13:14 (NKJV)
14 The grace of the Lord Jesus Christ, and the love of God, and the communion of the Holy Spirit be with you all. Amen.
Ephesians 2:18 (NKJV)
18 For through Him we both have access by one Spirit to the Father.
I What do we mean by Trinity?
II Where do we come to learn of the Trinity?
III Trinity and the Christian Life
Heidelberg Catechism, Lord’s Day 8
How are these articles divided?
Into three parts; the first is of God the Father, and our creation; the second of God the Son, and our redemption; the third of God the Holy Ghost, and our sanctification.
Since there is but one only divine essence, why speakest thou of Father, Son, and Holy Ghost?
Because God has so revealed himself in his word,b that these three distinct persons are the one only true and eternal God.
Westminster Shorter Catechism
Q. 5. Are there more Gods than one?
A. There is but One only, the living and true God.
Q. 6. How many persons are there in the Godhead?
A. There are three persons in the Godhead; the Father, the Son, and the Holy Ghost; and these three are one God, the same in substance, equal in power and glory.