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Some things hard to be understood, which they that are unlearned and unstable wrest, as they do also the other scriptures, unto their own destruction. 2 Peter 3:16
Thou shalt have no other gods before me. 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. Thou shalt not bow down thyself to them, nor serve them. Exodus 20:4-5
This verse is the basis of the Jehovah's Witness ban on saluting the flag. The governing body says that saluting the flag is a form of idol worship.
The Flag Salute Cases: A Turning Point for Religious Liberty Douglas O. Linder (2018)