In Acts 22:4, Paul earlier describes persecuting the Way to the death, directly paralleling his imprisonment and beating of believers mentioned here.

Acts 8:3 narrates Saul ravaging the church, dragging off believers to prison — the very deeds Paul now recalls doing in synagogues.

Acts 9:1 shows Saul still breathing threats, providing the context for the zealous persecution Paul confesses in this verse.

In Acts 26:9-12, Paul recounts his persecution before Agrippa, including punishing believers in synagogues — a fuller account of the same activities.

In Acts 9:13, Ananias confirms the reports of Paul's persecution, corroborating the same actions Paul now confesses.

Acts 26:10 expands on Paul's persecution, adding that he voted to put saints to death, filling out the extent of his former zeal.

Acts 26:11 continues Paul's account, mentioning his attempts to force blasphemy and his rage, deepening the portrait of his fierce opposition.

Matthew 10:17 warns of flogging in synagogues — Paul’s own actions here match that very persecution Jesus predicted for his followers.

Matthew 23:34 prophesies flogging in synagogues — Paul now confesses he was the one carrying out that persecution.

Mark 13:9 specifically warns of being beaten in synagogues — Paul says he did exactly that to believers, fulfilling Jesus’ warning.

John 16:2 says persecutors will think they serve God — Paul’s zeal to imprison and beat believers demonstrates that mindset.