Promise of the Holy Spirit

Jesus told us that we would do the same works He did and even greater ones...

Most assuredly, I say to you, he who believes in Me, the works that I do he will do also; and greater works than these he will do, because I go to My Father.  John 14:12

Signs should follow believers...

And He said to them, “Go into all the world and preach the gospel to every creature. He who believes and is baptized will be saved; but he who does not believe will be condemned. And these signs will follow those who believe: In My name they will cast out demons; they will speak with new tongues; they will take up serpents; and if they drink anything deadly, it will by no means hurt them; they will lay hands on the sick, and they will recover.” Mark 16:15-18

Promise of the Father of power from on high...

Behold, I send the Promise of My Father upon you; but tarry in the city of Jerusalem[a] until you are endued with power from on high. Luke 24:49

Power to be witnesses is from the Holy Spirit...

But you shall receive power when the Holy Spirit has come upon you; and you shall be witnesses to Me in Jerusalem, and in all Judea and Samaria, and to the end of the earth. Acts 1:8