A Son Promisse to Abraham and Sarah

And the Lord appeared to him by the oaks of Mamre, as he sat at the door of his tent in the heat of the day. He lifted up his eyes and looked, and behold, three men stood in front of him. When he saw them, he ran from the tent door to meet them, and bowed himself to the earth, They said to him, "Where is Sarah your wife?" And he said, "She is in the tent". The Lord said, "I will surely return to you in the spring, and Sarah your wife shall have a son." And Sarah was listening at the tent door behind him (Genesis 18,1-14).

Baptism of Jesus by John the Baptizer

In those days Jesus came from Nazareth of Galilee and was baptized by John in the Jordan. And when he came up out of the water, immediately he saw the heavens opened and the Spirit descending upon him like a dove; and a voice came from heaven, "Thou art my beloved Son; with thee I am well pleased" (Mark 1, 9-11).

Jesus answers Philip

Philip said to him, "Lord, show us the Father, and we shall be satisfied." Jesus said to him, "Have I been with you so long, and yet you do not know me, Philip? He who has seen me has seen the Father; how can you say, `Show us the Father'? Do you not believe that I am in the Father and the Father in me? ; […] And I will pray the Father, and he will give you another Counselor, to be with you for ever, even the Spirit of truth, whom the world cannot receive, because it neither sees him nor knows him; you know him, for he dwells with you, and will be in you […] These things I have spoken to you, while I am still with you.  But the Counselor, the Holy Spirit, whom the Father will send in my name, he will teach you all things, and bring to your remembrance all that I have said to you (John 14, 8-26).

The end of Matthew' Gospel

A 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 (Matthew 28, 19).

After the resurrection of Jesus

This Jesus God raised up, and of that we all are witnesses. Being therefore exalted at the right hand of God, and having received from the Father the promise of the Holy Spirit, he has poured out this which you see and hear (Acts 2, 32-33).

Some trinitary verses