Contradiction with Hebrews 10:25
This verse encourages gathering together, while Acts 19:9 shows Paul's disciples separating themselves.
Hebrews 10:25: Not forsaking the assembling of ourselves together, as the manner of some [is]; but exhorting [one another]: and so much the more, as ye see the day approaching.
Contradiction with 1 Corinthians 1:10
This verse emphasizes unity among believers, whereas Acts 19:9 describes a division.
1 Corinthians 1:10: Now I beseech you, brethren, by the name of our Lord Jesus Christ, that ye all speak the same thing, and [that] there be no divisions among you; but [that] ye be perfectly joined together in the same mind and in the same judgment. [divisions: Gr. schisms]
Contradiction with Romans 15:5-6
This verse speaks of being like-minded and united, in contrast to the dissent and withdrawal in Acts 19:9.
Romans 15:5-6: Now the God of patience and consolation grant you to be likeminded one toward another according to Christ Jesus: [according to: or, after the example of]
Contradiction with Ephesians 4:3
This verse urges believers to maintain the unity of the Spirit, contrary to the separation in Acts 19:9.
Ephesians 4:3: Endeavouring to keep the unity of the Spirit in the bond of peace.