Matthew 12:45 says the last state is worse than the first — exactly the same worsening seen in the proselyte becoming twice as much a child of hell.

In John 8:44, Jesus calls Pharisees children of the devil, directly parallel to 'son of hell' from Matthew 23:15.

In Galatians 4:17, false teachers' zealous but harmful proselytizing mirrors the Pharisees' making converts twice as evil.

Ephesians 2:3 uses the same 'children of wrath' phrase — here by nature, while Pharisees make converts twice as much children of hell.

Luke 6:40 states that disciples become like their teacher—explaining why the proselyte becomes twice as much a child of hell, mirroring the Pharisees.

Luke 11:26 describes a person’s final state being worse than the first—parallel to the proselyte becoming twice as much a child of hell.

In Acts 13:10, Paul calls Elymas 'child of the devil' — similar epithet as 'son of hell' for the Pharisees.

In Galatians 6:12, those compelling circumcision for selfish motives echo the Pharisees' hypocritical zeal in making converts.

Acts 20:30 warns of false teachers drawing disciples after them—similar to Pharisees making proselytes who follow their false teaching.

Galatians 6:13 condemns those who boast in circumcising others while not keeping the law—parallel to Pharisees boasting in proselytes while being hypocrites.