The Spetuagent is the Greek translation of the Hebrew Old Testament. Moses wrote the first 5 books. How did Moses know what to write? It was inspired by the Holy Spirit of God but he had reliable sources through Adam and Methuselah. Stephen is retelling the story of Moses up til verse 50. Then he turns to preach to the people the things they really needed to hear. They had one from heaven and yet did not believe. When people get convicted, and they don't know what to do with it, they get mean. Stephen was stoned because of this.