Then calling 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 weakness.

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

Finally he appeared unto the eleven as they sat at the table and upbraided them for their unbelief and hardness of heart because they did not believe those who had seen him after he was risen. And he said unto them, Go ye into all the world and preach the gospel to every creature. He that believes and is baptized shall be saved, but he that believes not shall be condemned. read more.
And these signs shall follow those that believe: In my name they shall cast out demons; they shall speak with new tongues; they shall take away serpents; and if they drink any deadly thing, it shall not hurt them; they shall lay hands upon the sick, and they shall be healed.

Luke 24:36-49

And as they spoke these things, Jesus himself stood in the midst of them and said unto them, Peace be unto you. But they were terrified and frightened, and supposed that they were seeing a spirit. And he said unto 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 does not have flesh and bones, as ye see me have. And when he had thus spoken, he showed them his hands and his feet. And as they were not believing him yet for joy and wondering, he said unto them, Have ye here any food? So they gave him a piece of a broiled fish and of a honeycomb. And he took it and ate before them. And he said unto them, These are the words which I spoke unto 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 unto them, Thus it is written, and thus it behooved the 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 from Jerusalem. And ye are witnesses of these things. And, behold, I shall 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 of the sabbaths, when the doors were shut where the disciples were assembled for fear of the Jews, Jesus came and stood in the midst and said unto them, Peace be unto you. And having said this, he showed them his hands and his side. Then the disciples were glad when they saw the Lord. Then Jesus said to them again, Peace be unto you; as my Father has sent me, even so send I you. read more.
And when he had said this, he breathed on them and said unto them, Receive ye the Holy Spirit; unto those whose sins ye release, they shall be released; and unto those whose sins ye retain, they shall be retained.