And he shall
The appeal here is national to the Jewish people as such, not individuals as in Peter's first sermon (Acts 2:38); (Acts 2:39). There those who were pricked in heart were exhorted to save themselves from (among) the untoward nation; here the whole people is addressed, and the promise to national repentance is national deliverance: "and he shall send Jesus Christ" to bring in the times which the prophets had foretold.
( See Scofield) - (Acts 2:14).
The official answer was the imprisonment of the apostles, and the inhibition to preach, so fulfilling (Luke 19:14).