PP - The Confessional Connection

From the Westminster Confession of Faith:

CHAPTER XXI.
Of Religious Worship and the Sabbath-day.

I. The light of nature shows that there is a God, who has lordship and sovereignty over all, is good, and does 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. 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.

From the 1689 London Baptist Confession:

22. Worship and the Sabbath Day

1. The light of nature shows that there is a God Who has lordship and sovereignty over all, is just and good, and Who does good to all. Therefore He is to be feared, loved, praised, called upon, trusted in, and served, with all the heart and all the soul, and with all the might. But the acceptable way of worshipping the true God has been instituted by Himself, and therefore our method of worship is limited by His own revealed will. He may not be worshipped according to the imagination and devices of men, nor the suggestions of Satan. He may not be worshipped by way of visible representations, or by any other way not prescribed in the Holy Scriptures.

I plan to expand on the confessional aspects, but I wanted to post the relevant sections for reference.

Note the use of "prescribed" as opposed to "commanded" - I contend that this is a very precise choice\use of words by the confession framers, as I began to explain\define here.