2 Samuel 3:6
"And it came to pass, while there was war between the house of Saul and the house of David, that Abner made himself strong for the house of Saul."
Cross References (ranked by relevance)
Matthew 12:30
He that is not with me is against me; and he that gathereth not with me scattereth abroad.
2 Chronicles 25:8
But if thou wilt go, do it, be strong for the battle: God shall make thee fall before the enemy: for God hath power to help, and to cast down.
Proverbs 21:30
There is no wisdom nor understanding nor counsel against the LORD.
2 Kings 10:23
And Jehu went, and Jehonadab the son of Rechab, into the house of Baal, and said unto the worshippers of Baal, Search, and look that there be here with you none of the servants of the LORD, but the worshippers of Baal only.