But now thus says the LORD,
he who created you, O Jacob,
he who formed you, O Israel:
“Fear not, for I have redeemed you;
I have called you by name, you are mine.
When you pass through the waters, I will be with you;
and through the rivers, they shall not overwhelm you;
when you walk through fire you shall not be burned,
and the flame shall not consume you.
For I am the LORD your God,
the Holy One of Israel, your Savior.
I give Egypt as your ransom,
Cush and Seba in exchange for you.
Because you are precious in my eyes,
and honored, and I love you,
I give men in return for you,
peoples in exchange for your life.
Fear not, for I am with you;
I will bring your offspring from the east,
and from the west I will gather you.
I will say to the north, Give up,
and to the south, Do not withhold;
bring my sons from afar
and my daughters from the end of the earth,
everyone who is called by my name,
whom I created for my glory,
whom I formed and made.”
Bring out the people who are blind, yet have eyes,
who are deaf, yet have ears!
All the nations gather together,
and the peoples assemble.
Who among them can declare this,
and show us the former things?
Let them bring their witnesses to prove them right,
and let them hear and say, It is true.
“You are my witnesses,” declares the LORD,
“and my servant whom I have chosen,
that you may know and believe me
and understand that I am he.
Before me no god was formed,
nor shall there be any after me.
I, I am the LORD,
and besides me there is no savior.
I declared and saved and proclaimed,
when there was no strange god among you;
and you are my witnesses,” declares the LORD, “and I am God.
Isaiah 43:1-12 ESV)
In the first book, O Theophilus, I have dealt with all that Jesus began to do and teach, until the day when he was taken up, after he had given commands through the Holy Spirit to the apostles whom he had chosen. He presented himself alive to them after his suffering by many proofs, appearing to them during forty days and speaking about the kingdom of God.
And while staying with them he ordered them not to depart from Jerusalem, but to wait for the promise of the Father, which, he said, “you heard from me; for John baptized with water, but you will be baptized with the Holy Spirit not many days from now.”
So when they had come together, they asked him, “Lord, will you at this time restore the kingdom to Israel?” He said to them, “It is not for you to know times or seasons that the Father has fixed by his own authority. But you will receive power when the Holy Spirit has come upon you, and you will be my witnesses in Jerusalem and in all Judea and Samaria, and to the end of the earth.” And when he had said these things, as they were looking on, he was lifted up, and a cloud took him out of their sight. And while they were gazing into heaven as he went, behold, two men stood by them in white robes, and said, “Men of Galilee, why do you stand looking into heaven? This Jesus, who was taken up from you into heaven, will come in the same way as you saw him go into heaven.”
(Acts 1:1-11 ESV)