Contradiction with Matthew 5:9
This verse encourages peace and being peacemakers, which may contradict the gathering of armed troops in 1 Chronicles 12:37.
Matthew 5:9: Blessed [are] the peacemakers: for they shall be called the children of God.
Contradiction with Exodus 20:13
This commandment, "Thou shalt not kill," could be seen as contradictory to the preparation for battle in 1 Chronicles 12:37.
Exodus 20:13: Thou shalt not kill.
Contradiction with Romans 12:18
Advises living peaceably with all men, contrasting with the militaristic assembly described in 1 Chronicles 12:37.
Romans 12:18: If it be possible, as much as lieth in you, live peaceably with all men.