Does the Bible say not to swear?

The Bible also tells us that “if your tongue blasphemes, turn not against your neighbor.”

However, if some one of our mouths speaks so bad that others think he is speaking ill of himself or of those under his dominion, that is a serious offense. If we have committed the fault of the mouth and have done this, then we are on our own again. It is not the fault of the Bible. The Bible is very generous with us in saying that we are not to blaspheme against the holy Scriptures with our own mouth in words that ought to be spoken only in public. It does not speak that they shall say anything that may cause offense and should be punished by the law. Now, let us say what we ought to do to our fellow man. We are to pray to God for the protection of our brethren who are under our dominion in all that concerns them and for the blessings of peace toward every one who is of our own kingdom in all the matters of peace in which this kingdom depends on them. When we say what we ought to do to these brethren, we are not speaking of the Word of God, for the Word is God and our own mouth is only the mouth of this one who is God. But in these cases, we are not speaking of the Word of God, for if they are to be found in the Bible, they are not spoken of the Word of God, for the Word of God is written in the books of the Law of Moses and the Prophets through the mouth of this one God. We are speaking now in our own mouth, not about what the Lord said,
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“Ye shall keep my Sabbaths, saith the Lord God of Hosts” (Leviticus 14:31).

We say, however, our brethren in the Lord, for we are speaking to our brethren—their own brethren. We are only speaking in the name of God, for the Church stands in a union with the Lord and we only speak according to his Will. When we say “that our mouth shall say,” we are not speaking of the Word of God, for it was prophesied by the Holy Spirit, “Behold, I will take away the sins of the sons of Ammon, and they shall write them on the tablets of brass” (Rev. 14:30).

I have never seen, and I do not see, that the Holy Spirit would take away the sins of the sons of Ammon. But when they sin in the body