Contradiction with Exodus 23:1
"Thou shalt not raise a false report: put not thine hand with the wicked to be an unrighteous witness." Acts 6:12 involves stirring up people against someone, which contrasts with the command against false reports.
Exodus 23:1: Thou shalt not raise a false report: put not thine hand with the wicked to be an unrighteous witness. [raise: or, receive]
Contradiction with Proverbs 6:16-19
"These six things doth the LORD hate: ... a false witness that speaketh lies, and he that soweth discord among brethren." These actions contradict the conduct of those in Acts 6:12 causing discord and false testimony.
Proverbs 6:16-19: These six [things] doth the LORD hate: yea, seven [are] an abomination unto him: [unto...: Heb. of his soul]
Contradiction with Matthew 5:44
"But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you." Acts 6:12 involves stirring up hostility, opposed to loving enemies.
Matthew 5:44: But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you;
Contradiction with Romans 12:18
"If it be possible, as much as lieth in you, live peaceably with all men." Acts 6:12 involves creating unrest, contradicting the exhortation to live peaceably.
Romans 12:18: If it be possible, as much as lieth in you, live peaceably with all men.
Contradiction with 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." The divisive actions in Acts 6:12 go against the peaceable wisdom described here.
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]