One of the great accounts of the appearances of the Lord Jesus Christ to his disciples following the resurrection is his appearance to the two Emmaus disciples recorded in Luke 24. It is an interesting story for a number of reasons, and one is that Jesus preached a sermon on that occasion. It is referred to in verse 27: “And beginning with Moses and all the Prophets, he explained to them what was said in all the Scriptures concerning himself.”
In his classic treatment of the evidences for the resurrection of Christ, Who Moved the Stone? Frank Morison calls attention to Paul's undoubted knowledge of the fact that the tomb of Jesus Christ was found empty. Everyone in Jerusalem would have known this, and Paul in particular must have known of it.