Exodus 20:4-7 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: for I the LORD thy God am a jealous God, visiting the iniquity of the fathers upon the children unto the third and fourth generation of them that hate me; And shewing mercy unto thousands of them that love me, and keep my commandments.
Though typically shortened to Thou shalt not make unto thee any graven image the 2nd commandment is the longest commandment serving as a complete prohibition against making any likeness of anything in air, land, or sea. Bowing before such likenesses is also prohibited. This is because God is jealous.
The "iniquity" will be visited unto the third and fourth generations.
- God will punish you for having your great grandfather draw a picture of a fish.