Contradiction with Matthew 5:39
Acts 21:12 shows the disciples advising Paul not to go to Jerusalem to avoid harm, conflicting with Matthew 5:39's teaching to resist not evil, and turn the other cheek.
Matthew 5:39: But I say unto you, That ye resist not evil: but whosoever shall smite thee on thy right cheek, turn to him the other also.
Contradiction with Matthew 16:24
In Acts 21:12, the disciples' plea contrasts with the call in Matthew 16:24 to take up the cross and follow Jesus, even to suffering.
Matthew 16:24: Then said Jesus unto his disciples, If any [man] will come after me, let him deny himself, and take up his cross, and follow me.
Contradiction with Luke 9:24
Acts 21:12 suggests avoiding danger, contrary to Luke 9:24, which teaches that losing one's life for Christ's sake is saving it.
Luke 9:24: For whosoever will save his life shall lose it: but whosoever will lose his life for my sake, the same shall save it.
Contradiction with Acts 20:24
Paul declares he is not moved by threats, contradicting his companions' fear in Acts 21:12.
Acts 20:24: But none of these things move me, neither count I my life dear unto myself, so that I might finish my course with joy, and the ministry, which I have received of the Lord Jesus, to testify the gospel of the grace of God.
Contradiction with Philippians 1:21
Acts 21:12 implies avoiding death, whereas Philippians 1:21 states that dying is gain, showing a fearless attitude toward death.
Philippians 1:21: For to me to live [is] Christ, and to die [is] gain.