Acts 7:8

Stephen probably referred to God giving Abraham the covenant of circumcision (Genesis 17) because this was the sign that God would deliver what He had promised. It was the seal of the Abrahamic Covenant. God’s promise was firm. Moreover God enabled Abraham to father Isaac, whom Abraham obediently circumcised, and later Isaac gave birth to Jacob who fathered the 12 patriarchs. Thus this chapter in Israel’s history ends with emphasis on God’s faithfulness to His promises to Abraham. The Sanhedrin needed to reevaluate these promises in the light of how God was working in their day.

Stephen affirmed belief that the God of glory had given the Abrahamic Covenant, which contained promises of land (Acts 7:2-4), seed (Acts 7:5), and blessing (Acts 7:6-7). He had sealed this covenant with a sign, namely, circumcision (Acts 7:8). Circumcision was one of the Jewish customs that would pass away in view of the new revelation that had come through Jesus Christ (cf. Acts 6:14).

Throughout his speech Stephen made many statements that had revolutionary implications for traditional Jewish thinking of his day. He did not expound these implications, but they are clear in view of what the disciples of Jesus were preaching. As such his speech is a masterpiece of understatement, or rather non-statement. That the Sanhedrin saw these implications and rejected them becomes clear at the end of the speech when they reacted as negatively as possible.