Contradiction with Matthew 5:10
Matthew 5:10 blesses those who are persecuted for righteousness' sake, whereas Acts 4:21 shows the apostles being threatened for their actions.
Matthew 5:10: Blessed [are] they which are persecuted for righteousness' sake: for theirs is the kingdom of heaven.
Contradiction with Romans 8:35
Romans 8:35 indicates that persecution cannot separate believers from the love of Christ, contrasting with the fear of threats in Acts 4:21.
Romans 8:35: Who shall separate us from the love of Christ? [shall] tribulation, or distress, or persecution, or famine, or nakedness, or peril, or sword?
Contradiction with 1 Peter 4:14
1 Peter 4:14 states that being reproached for Christ is a sign of blessing, contradicting the idea of being threatened in Acts 4:21.
1 Peter 4:14: If ye be reproached for the name of Christ, happy [are ye]; for the spirit of glory and of God resteth upon you: on their part he is evil spoken of, but on your part he is glorified.
Contradiction with John 15:20
John 15:20 explains that followers of Jesus will face persecution, showing a contrast to the fear of threats in Acts 4:21.
John 15:20: Remember the word that I said unto you, The servant is not greater than his lord. If they have persecuted me, they will also persecute you; if they have kept my saying, they will keep yours also.
Contradiction with 2 Timothy 3:12
2 Timothy 3:12 states that all who live godly lives will suffer persecution, which contradicts the notion in Acts 4:21 of being threatened for doing good.
2 Timothy 3:12: Yea, and all that will live godly in Christ Jesus shall suffer persecution.
Contradiction with Hebrews 11:25
Hebrews 11:25 mentions choosing to suffer affliction with God's people, contradicting the decision to avoid punishment in Acts 4:21.
Hebrews 11:25: Choosing rather to suffer affliction with the people of God, than to enjoy the pleasures of sin for a season;