And when he had called to him his twelve disciples, he gave them power against unclean spirits, to cast them out, and to heal all manner of sickness, and all manner of disease.

Matthew 28:19

Go ye therefore and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Spirit.

Jesus Christ » History of » Appears in the midst of the disciples, when thomas was absent (in jerusalem)

Mark 16:14-18

Afterward he appeared to the eleven, as they sat at table, and upbraided them with their unbelief, and hardness of heart, because they believed not them who had seen him after he was risen. And he said to them, Go ye into all the world, and preach the gospel to every creature. He that believeth and is baptized, shall be saved; but he that believeth not shall be damned. read more.
And these signs shall follow them that believe: In my name shall they cast out demons; they shall speak in new languages; They shall take up serpents; and if they drink any deadly thing, it shall not hurt them; they shall lay hands on the sick, and they shall recover.

Luke 24:36-49

And as they were thus speaking, Jesus himself stood in the midst of them, and saith to them, Peace be to you. But they were terrified and affrighted, and supposed that they had seen a spirit. And he said to them, Why are ye troubled? and why do thoughts arise in your hearts? read more.
Behold my hands and my feet, that it is I myself: handle me, and see; for a spirit hath not flesh and bones, as ye see me have. And when he had thus spoken, he showed them his hands and his feet. And while they yet believed not for joy, and wondered, he said to them, Have ye here any thing for food? And they gave him a piece of a broiled fish, and a honey-comb. And he took it, and ate before them. And he said to them, These are the words which I spoke to you, while I was yet with you, that all things must be fulfilled, which were written in the law of Moses, and in the prophets, and in the psalms, concerning me. Then he opened their understanding, that they might understand the scriptures, And said to them, Thus it is written, and thus it behooved Christ to suffer, and to rise from the dead the third day: And that repentance and remission of sins should be preached in his name among all nations, beginning at Jerusalem. And ye are witnesses of these things. And behold, I send the promise of my Father upon you: but tarry ye in the city of Jerusalem, until ye are endued with power from on high.

John 20:19-23

Then the same day at evening, being the first day of the week, when the doors were shut where the disciples were assembled for fear of the Jews, Jesus came and stood in the midst, and saith to them, Peace be to you. And when he had so said, he showed to them his hands and his side. Then were the disciples glad when they saw the Lord. Then said Jesus to them again, Peace be to you: as my Father hath sent me, even so I send you. read more.
And when he had said this, he breathed on them, and saith to them, Receive ye the Holy Spirit. Whose soever sins ye remit, they are remitted to them; and whose soever sins ye retain, they are retained.