Contradiction with Exodus 20:4
This verse prohibits the making of graven images, whereas 1 Samuel 6:8 describes the Philistines placing golden images in the ark.
Exodus 20:4: Thou shalt not make unto thee any graven image, or any likeness [of any thing] that [is] in heaven above, or that [is] in the earth beneath, or that [is] in the water under the earth:
Contradiction with Deuteronomy 4:16
Warns against creating graven and molten images, contrasting with the crafting of figures mentioned in 1 Samuel 6:8.
Deuteronomy 4:16: Lest ye corrupt [yourselves], and make you a graven image, the similitude of any figure, the likeness of male or female,
Contradiction with Leviticus 26:1
Forbids making idols or graven images to worship, conflicting with the action of sending golden images in 1 Samuel 6:8.
Leviticus 26:1: Ye shall make you no idols nor graven image, neither rear you up a standing image, neither shall ye set up [any] image of stone in your land, to bow down unto it: for I [am] the LORD your God. [standing...: or, pillar] [image of...: or, figured stone: Heb. a stone of picture]
Contradiction with Isaiah 42:8
States that God will not share His glory with idols, yet 1 Samuel 6:8 involves sending golden images in association with the ark.
Isaiah 42:8: I [am] the LORD: that [is] my name: and my glory will I not give to another, neither my praise to graven images.