Contradiction with Exodus 20:4
This verse prohibits making any graven images, which could be seen as contradictory to the detailed crafting and ornamentation instructions for the altar with its horns described in Exodus 27:2.
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 Exodus 25:18
Here, instructions are given to make two cherubim of gold, which could be seen as contradictory to the earlier warning against making images, similar to the decorative elements in Exodus 27:2.
Exodus 25:18: And thou shalt make two cherubims [of] gold, [of] beaten work shalt thou make them, in the two ends of the mercy seat.
Contradiction with Deuteronomy 5:8
Reiterates the command against making graven images or likenesses, potentially conflicting with the ornate descriptions in Exodus 27:2 regarding the altar's design.
Deuteronomy 5:8: Thou shalt not make 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 waters beneath the earth: