Contradiction with Deuteronomy 20:1
Amos 5:3 speaks of Israel's diminished numbers in battle, while Deuteronomy 20:1 encourages confidence when facing larger armies due to God's support.
Deuteronomy 20:1: When thou goest out to battle against thine enemies, and seest horses, and chariots, [and] a people more than thou, be not afraid of them: for the LORD thy God [is] with thee, which brought thee up out of the land of Egypt.
Contradiction with Judges 7:7
Amos 5:3 predicts a drastic reduction of troops, whereas Judges 7:7 emphasizes victory with a very small number of men chosen by God.
Judges 7:7: And the LORD said unto Gideon, By the three hundred men that lapped will I save you, and deliver the Midianites into thine hand: and let all the [other] people go every man unto his place.
Contradiction with 1 Samuel 14:6
Amos 5:3 speaks of loss despite numbers, while 1 Samuel 14:6 illustrates Jonathan's belief that God can save irrespective of numbers.
1 Samuel 14:6: And Jonathan said to the young man that bare his armour, Come, and let us go over unto the garrison of these uncircumcised: it may be that the LORD will work for us: for [there is] no restraint to the LORD to save by many or by few.
Contradiction with 2 Chronicles 20:15
Amos 5:3 describes a reduced force, but 2 Chronicles 20:15 assures victory because the battle is the Lord's, not dependent on manpower.
2 Chronicles 20:15: And he said, Hearken ye, all Judah, and ye inhabitants of Jerusalem, and thou king Jehoshaphat, Thus saith the LORD unto you, Be not afraid nor dismayed by reason of this great multitude; for the battle [is] not yours, but God's.
Contradiction with Psalm 33:16
Amos 5:3 emphasizes what's lost by a lack of numbers, contrary to Psalm 33:16, which states a king is not saved by an army's multitude.
Psalm 33:16: There is no king saved by the multitude of an host: a mighty man is not delivered by much strength.
Contradiction with Isaiah 31:1
Amos 5:3 implies decrease in manpower leads to defeat, whereas Isaiah 31:1 argues against relying on military might instead of God's help.
Isaiah 31:1: Woe to them that go down to Egypt for help; and stay on horses, and trust in chariots, because [they are] many; and in horsemen, because they are very strong; but they look not unto the Holy One of Israel, neither seek the LORD!