Following Peter and John's miraculous healing of the lame man at the Temple gate, Peter delivers a theologically rich sermon to the gathering crowd. In it, he explains that the Jesus that they killed was the Suffering Servant about whom Isaiah spoke and the Prophet that would replace Moses. This sermon also demonstrates that the message of the early Church was the same as it is today: Repent and you shall be saved.

For more information about Isaiah's suffering servant, see an extended examination here: https://www.youtube.com/playlist?list=PLgy9J3oOI6vM4OPx594CmOZ3vOXMP3-w_