Then the two recounted what had taken place on the way and how he was made known to them in the breaking of the bread. While they were still speaking about this, he stood in their midst and said to them, "Peace be with you." But they were startled and terrified and thought that they were seeing a ghost. Then he said to them, "Why are you troubled? And why do questions arise in your hearts? Look at my hands and my feet, that it is I myself. Touch me and see, because a ghost does not have flesh and bones as you can see I have." And as he said this, he showed them his hands and his feet. While they were still incredulous for joy and were amazed, he asked them, "Have you anything here to eat?" They gave him a piece of baked fish; he took it and ate it in front of them. He said to them, "These are my words that I spoke to you while I was still with you, that everything written about me in the law of Moses and in the prophets and psalms must be fulfilled." Then he opened their minds to understand the scriptures. And he said to them, "Thus it is written that the Messiah would suffer and rise from the dead on the third day and that repentance, for the forgiveness of sins, would be preached in his name to all the nations, beginning from Jerusalem. You are witnesses of these things. (Lk 24:35-48)
Jesus reveals himself to his disciples. He talks to them as he would do with them while he was on earth doing his ministry. He realizes their incredulity. He gives them physical proofs. He asks them to touch and see and he even asks them give him food to eat. He is only trying to prove that he is the very same person. So the resurrection experiences of the disciples are of the very same Jesus and someone else.
Jesus also confirmed their faith in his resurrection by using scriptures. He quotes from Moses and the prophets to prove that his life of suffering and death and resurrection were foretold by the prophets and the law. His life was for the forgiveness of sin and hence he is the messiah for the people of Israel. Jesus after his resurrection uses scriptures as well to make his disciples to realize that he was the same person whom they have lived with earlier.
Now they are asked to be his witnesses. Witnesses to the whole world and witnesses of all these things. They are to be witnesses of everything that has taken place for Jesus: his suffering, death and resurrection. They are to bear witness by preaching repentance and forgiveness of sins.
