The 2nd commandment can be found in Exodus 20:4-6: "You shall not make for yourself a carved image, or any likeness of anything that is in heaven above, or that is in the earth beneath, or that is in the water under the earth. You shall not bow down to them or serve them, for I the Lord your God am a jealous God, visiting the iniquity of the fathers on the children to the third and the fourth generation of those who hate Me, but showing steadfast love to thousands of those who love Me and keep My commandments. Basically the 2nd commandment means, we as Children of God must not make any form of idol image and worship them for they are false gods. The Egyptians in those days were known to worship lots of idol images and God through Moses warned the Children of Israel not to worship such gods.