8But you will receive power when the Holy Spirit has come upon you; and you will be my witnesses in Jerusalem, in all Judea and Samaria, and to the ends of the earth.’ 9When he had said this, as they were watching, he was lifted up, and a cloud took him out of their sight. 10While he was going and they were gazing up towards heaven, suddenly two men in white robes stood by them. 11They said, ‘Men of Galilee, why do you stand looking up towards heaven? This Jesus, who has been taken up from you into heaven, will come in the same way as you saw him go into heaven.’
Acts 1:8-11

18And Jesus came and said to them, ‘All authority in heaven and on earth has been given to me. 19Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, 20and teaching them to obey everything that I have commanded you. And remember, I am with you always, to the end of the age.’
Matthew 28:18-20