The host cited this resurrection-appearance passage to show Jesus taught that the Scriptures foretold the Messiah's suffering, resurrection, and proclamation of forgiveness in his name.
bible
44 He said to them, "This is what I told you, while I was still with you, that all things which are written in the law of Moses, the prophets, and the psalms, concerning me must be fulfilled." 45 Then he opened their minds, that they might understand the Scriptures. 46 He said to them, "Thus it is written, and thus it was necessary for the Christ to suffer and to rise from the dead the third day, 47 and that repentance and remission of sins should be preached in his name to all the nations, beginning at Jerusalem. 48 You are witnesses of these things.
Used to answer what gospel Jesus sent the disciples to preach: that the Christ would suffer, rise on the third day, and that repentance and forgiveness of sins should be proclaimed in his name.