When he had risen, early on the first day of the week, he appeared first to Mary Magdalene, out of whom he had driven seven demons. She went and told his companions who were mourning and weeping. When they heard that he was alive and had been seen by her, they did not believe. After this he appeared in another form to two of them walking along on their way to the country. They returned and told the others; but they did not believe them either. (But) later, as the eleven were at table, he appeared to them and rebuked them for their unbelief and hardness of heart because they had not believed those who saw him after he had been raised. He said to them, "Go into the whole world and proclaim the gospel to every creature. (Mk 16, 9-15)
This is a summary statement of what had taken place after the resurrection until the beginning of the ministry.
The summary statement gives the real situation among the disciples. The situation was that, the resurrected Jesus appeared to the disciples individually and in groups. But the disciples did not believe the witnesses of the people who had seen the risen Lord. They did not believe in the witness of Mary Magdalene and the two disciples of Emmaus. Was it due to the disbelief among themselves on each other? Jesus also rebuked them for their disbelief and hardness of heart.
Probably the disciples wanted to have a personal experience for themselves. Each one wanted to witness the risen Lord personally. When he met them as a group he did not show them any signs of resurrection or any proof for resurrection. He should have done it because they did not believe the witnesses of the disciples who had seen him earlier.
The only proof or sign of resurrection that Jesus gives is the mission to be accomplished. The mission is to proclaim the gospel to all creatures. Fulfilling of the mission gives them the belief in the resurrection. Proclaiming the gospel is the belief in the resurrection.
