Contradiction with Matthew 5:9
Acts 9:29 describes Paul disputing, whereas Matthew 5:9 blesses peacemakers.
Matthew 5:9: Blessed [are] the peacemakers: for they shall be called the children of God.
Contradiction with Romans 12:18
Acts 9:29 involves conflict, while Romans 12:18 advises living peaceably with all.
Romans 12:18: If it be possible, as much as lieth in you, live peaceably with all men.
Contradiction with 1 Corinthians 1:10
Acts 9:29 involves disputes, but 1 Corinthians 1:10 calls for no divisions.
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 James 3:17
Acts 9:29 references debating, opposed to the peace promoted in James 3:17.
James 3:17: But the wisdom that is from above is first pure, then peaceable, gentle, [and] easy to be intreated, full of mercy and good fruits, without partiality, and without hypocrisy. [partiality: or, wrangling]
Contradiction with Philippians 4:5
Acts 9:29 involves argument, while Philippians 4:5 advises moderation.
Philippians 4:5: Let your moderation be known unto all men. The Lord [is] at hand.
Contradiction with 2 Timothy 2:24
Acts 9:29 involves strife, against 2 Timothy 2:24 promoting gentleness and patience.
2 Timothy 2:24: And the servant of the Lord must not strive; but be gentle unto all [men], apt to teach, patient, [patient: or, forbearing]