(Exodus, Ibid.) "gods of silver and gods of gold": What is the intent of this? Though it is written (Exodus 25:18) "And you shall make two golden cherubs," one should not say I shall make four. To this end it is written "gods of gold." If you make more than two, they are considered "gods of gold."
What Exactly Do These Phrases Add to the Prohibition Against Idolatry
Mekhilta Tractate Bachodesh 10:14