Contradiction with Matthew 5:44
1 Chronicles 19:9 describes preparations for battle, while Matthew 5:44 advises loving enemies and not engaging in conflict.
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 12:19
This verse advises against seeking personal revenge, implying trust in God's justice rather than preparing for war as in 1 Chronicles 19:9.
Romans 12:19: Dearly beloved, avenge not yourselves, but [rather] give place unto wrath: for it is written, Vengeance [is] mine; I will repay, saith the Lord.
Contradiction with Exodus 14:14
Suggests that God would fight for his people, contradicting the notion of preparing armies as done in 1 Chronicles 19:9.
Exodus 14:14: The LORD shall fight for you, and ye shall hold your peace.