And he said to them, “Go into all the world and proclaim the good news to the whole creation. The one who believes and is baptized will be saved; but the one who does not believe will be condemned. And these signs will accompany those who believe: by using my name they will cast out demons; they will speak in new tongues; they will pick up snakes in their hands, and if they drink any deadly thing, it will not hurt them; they will lay their hands on the sick, and they will recover.”
So then the Lord Jesus, after he had spoken to them, was taken up into heaven and sat down at the right hand of God. And they went out and proclaimed the good news everywhere, while the Lord worked with them and confirmed the message by the signs that accompanied it.
Mark 16:15-20 (NRSV)
For if the message declared through angels was valid, and every transgression or disobedience received a just penalty, how can we escape if we neglect so great a salvation? It was declared at first through the Lord, and it was attested to us by those who heard him, while God added his testimony by signs and wonders and various miracles, and by gifts of the Holy Spirit, distributed according to his will.
Hebrews 2:2-4 (NRSV)
Do you not believe that I am in the Father and the Father is in me? The words that I say to you I do not speak on my own; but the Father who dwells in me does his works. Believe me that I am in the Father and the Father is in me; but if you do not, then believe me because of the works themselves. Very truly, I tell you, the one who believes in me will also do the works that I do and, in fact, will do greater works than these, because I am going to the Father. I will do whatever you ask in my name, so that the Father may be glorified in the Son. If in my name you ask me for anything, I will do it.
“If you love me, you will keep my commandments. And I will ask the Father, and he will give you another Advocate, to be with you forever. This is the Spirit of truth, whom the world cannot receive, because it neither sees him nor knows him. You know him, because he abides with you, and he will be in you.
John 14: 10-14 (NRSV)
When they had prayed, the place in which they were gathered together was shaken; and they were all filled with the Holy Spirit and spoke the word of God with boldness. Now the whole group of those who believed were of one heart and soul, and no one claimed private ownership of any possessions, but everything they owned was held in common.
With great power the apostles gave their testimony to the resurrection of the Lord Jesus, and great grace was upon them all. There was not a needy person among them, for as many as owned lands or houses sold them and brought the proceeds of what was sold. They laid it at the apostles’ feet, and it was distributed to each as any had need.
Luke 4: 31-35 (NRSV)