WSC Q.49: Which is the second commandment?
The second commandment is, 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 thy self 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 showing mercy unto thousands of them that love me, and keep my commandments. (Exod. 20:4–6)
WLC Q.107: Which is the second commandment?
The second commandment is, 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 showing mercy unto thousands of them that love me, and keep my commandments. (Exod. 20:4–5,6)
WCF 21.1.
The light of nature sheweth that there is a God, who hath lordship and sovereignty over all, is good, and doth good unto all, and is therefore to be feared, loved, praised, called upon, trusted in, and served, with all the heart, and with all the soul, and with all the might. (Rom. 1:20, Acts 17:24, Ps. 119:68, Jer. 10:7, Ps. 31:23, Ps. 18:3, Rom. 10:12, Ps. 62:8, Josh. 24:14, Mark 12:33) But the acceptable way of worshipping the true God is instituted by Himself, and so limited by His own revealed will, that He may not be worshipped according to the imaginations and devices of men, or the suggestions of Satan, under any visible representation, or any other way not prescribed in the Holy Scripture. (Deut. 12:32, Matt. 15:9, Acts 17:25, Matt. 4:9–10, Deut. 15:1–20, Exod. 20:4–6, Col. 2:23)