All this means is that it is a very good representative of Anabaptist teaching. Therefore, it is also representative of what it says on vows and oaths:
Seventh. We are agreed as follows concerning the oath: The oath is a confirmation among those who are quarreling or making promises. In the Law it is commanded to be performed in God’s Name, but only in truth, not falsely. Christ, who teaches the perfection of the Law, prohibits all Swearing to His [followers], whether true or false, -- neither by heaven, nor by the earth, nor by Jerusalem, nor by our head, -- and that for the reason which He shortly thereafter gives, For you are not able to make one hair white or black. So you see it is for this reason that all Swearing is forbidden: we cannot fulfill that which we promise when we swear, for we cannot change [even] the very least thing on us.
The seventh and last article goes on to answer some common objections made against the first statement. A century later (1632), the Dutch Mennonites still confessed the same of what was said by Sattler:
XV. Of the Swearing of Oaths
Concerning the Swearing of oaths we believe and confess that the Lord Christ has set aside and forbidden the same to His disciples, that they should not swear at all, but that yea should be yea, and nay, nay; from which we understand that all oaths, high and low, are forbidden, and that instead of them we are to confirm all our promises and obligations, yea, all our declarations and testimonies of any matter, only with our word yea, in that which is yea, and with nay, in that which is nay; yet, that we must always, in all matters, and with everyone, adhere to, keep, follow, and fulfill the same, as though we had confirmed it with a solemn oath. And if we do this, we trust that no one, not even the Magistracy itself, will have just reason to lay a greater burden on our mind and conscience. Matt. 5:34, 35; Jas. 5:12; II Cor. 1:17.
This means that the teaching of the Anabaptists on this point was still alive. Thus the Reformed confessions added a chapter addressing this issue. This is likewise important for our forefather to confess since they were falsely called Anabaptists, as the title of the First London Confession read: “The CONFESSION OF FAITH, Of those CHURCHES which are commonly (though ) called ANABAPTISTS...” Since they confess the same as the Reformed on this subject, they distance themselves from the Anabaptists.
In paragraph 3, a passage from the Westminster and Savoy was omitted in the 1689, which said: “Yet it is a sin to refuse an oath touching any thing that is good and just, being lawfully imposed by authority.” Obviously, this is implied in what the Confession says that a lawful oath is and what is not. See the comparison here.
Thus, this chapter was added in the Reformed confessions in times of controversy and in order to clarify their stance upon oaths and vows made the government and the church.
§1 Lawful Oaths
- A lawful oath is a part of religious worship, wherein the person Swearing in truth, righteousness, and judgement, solemnly call...