Jeremiah 49:13

God is said to swear by himself, because there is none greater; as the apostle says, by whom he can swear. (Hebrews 6:13.) Men in doubtful and hidden things flee to God, who knows the heart, who is himself the truth, and from whom nothing is hid. And an oath, as we learn from many places of Scripture, is a part of divine worship. As then this honor peculiarly belongs to him, that is, that we should swear by his name, when he himself swears, he cannot derive authority from another, which may confirm his words: he therefore swears by himself. And we have heard what he declares by Isaiah,

“I will not give my glory to another.” (Isaiah 42:8)

God then prescribes to us the form of swearing, when he swears by himself. God is said to swear sometimes by his soul, or by his life, and he is said sometimes to lift up his hand. These expressions are not strictly proper, but transferred to God from men. But the mode of speaking used by Jeremiah ought especially to be observed, for we see how an oath is to be rightly made, even when it is made by an appeal to God’s name, for he is alone the fit witness and judge in things doubtful and hidden.

There is therefore under the Papacy a base and an intolerable idolatry, for the Papists swear by dead saints. This is nothing else but to rob God of his right; for since he alone, as it has been stated, is the truth, so he alone is the fit judge when things are hidden and cannot be ascertained by human testimony. And we ought to notice the words used in swearing, that is, when men submit to God’s judgment, and implore him as a judge. Whosoever then swears by the saints, it is the same thing as to make them to occupy the place of God, so as to make them the judges of the world, and to ascribe to them all power.

“God is a witness to my soul,”

says Paul, (2 Corinthians 1:23;) and then we have such words as these,

“May God do this to me and add that.” (Ruth 1:17; 1 Samuel 14:44; 2 Samuel 3:35, etc.)

By such expressions, as I have said, is set forth the authority and character of an oath. In short, we must bear in mind, that when necessity constrains us to swear, God is ever the sole judge, and that therefore his name is profaned when we swear by another.

Now what it is to be a reproach and a curse, is evident from other places, even when any one is set as it were in a theater, that he might be an example of disgrace, or when any calamity gives an occasion for execrations and maledictions, “May God destroy thee as he destroyed the Idumeans:” this is to be a curse, as we have elsewhere seen.

He adds cities, and thereby intimates that this desolation would not be confined to one part, but be extended to all parts. He also says that they would be perpetual wastes; and thus he took away every hope of restoration. When he prophesied before against the Moabites and the Ammonites, he mingled some consolation, but as to Edom, every hope is cut off. The nation, no doubt, deserved a heavier vengeance, for it had a nearer connection with the Israelites — hence its cruelty was less to be borne. Besides, it appears that it exceeded in its barbarity all other nations; for it is not without reason said in the Psalms,

“Remember, O Lord, the children of Edom, who said in the day of Jerusalem, Let it be erased, let it be wholly erased to its foundation.” (Psalm 137:7)

We hence learn that the Idumeans raged most cruelly against their own blood: and this was the reason why God declared that their cities would become perpetual desolations; for the word עולם, oulam, which some render “age,” often means perpetuity. It follows —