What happened when Peter preached his first sermon- Ancient promises came true- the Holy Spirit revived his people, forming a new Israel, from all the nations, in the midst of the old Israel. This was the -mystery hidden for ages,- as Paul wrote in Ephesians. This was the end of time beginning. --As a result of his sermon, the church spread throughout Jerusalem, and where it went, at least five characteristics distinguished it from all other entities and Temple worship.