The signs and wonders that took place on the first Pentecost after Christ’s death and resurrection are not self-explanatory. Such is made plain when witnesses ask for the meaning of these events. This prompting, along with mockery, frame the setting for Peter’s Scripture-saturated sermon that centers on Christ crucified and risen. At its opening, Peter presents a biblically grounded explanation of the meaning of what was happening. Powerful evidence of the dawning of the last days is given, underscoring the urgency of salvation.