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Of Lawful Oaths and Vows

Section 23.4

An oath is to be taken in the plain and common sense of the words, without equivocation or mental reservation. It cannot oblige to sin, but in any thing not sinful, being taken it binds to performance, although to a man's own hurt; nor is it to be violated, although made to heretics or infidels.

See also in WCF: 22.1 Compare: Of Lawful Oaths and Vows
Jer. 4:2
[2] and if you swear, ‘As the LORD lives,’ in truth, in justice, and in righteousness, then nations shall bless themselves in him, and in him shall they glory.”
Ps. 24:4
[4] He who has clean hands and a pure heart, who does not lift up his soul to what is false and does not swear deceitfully.
1 Sam. 25:22, 32, 33, 34
[22] God do so to the enemies of David and more also, if by morning I leave so much as one male of all who belong to him.” [32] And David said to Abigail, “Blessed be the LORD, the God of Israel, who sent you this day to meet me! [33] Blessed be your discretion, and blessed be you, who have kept me this day from bloodguilt and from working salvation with my own hand! [34] For as surely as the LORD, the God of Israel, lives, who has restrained me from hurting you, unless you had hurried and come to meet me, truly by morning there had not been left to Nabal so much as one male.”
Ps. 15:4
[4] in whose eyes a vile person is despised, but who honors those who fear the LORD; who swears to his own hurt and does not change;
Ezek. 17:16, 18, 19
[16] “As I live, declares the Lord GOD, surely in the place where the king dwells who made him king, whose oath he despised, and whose covenant with him he broke, in Babylon he shall die. [18] He despised the oath in breaking the covenant, and behold, he gave his hand and did all these things; he shall not escape. [19] Therefore thus says the Lord GOD: As I live, surely it is my oath that he despised, and my covenant that he broke. I will return it upon his head.
Josh. 9:18, 19 with 2 Sam. 21:1
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Chapter 23: Of Lawful Oaths and Vows

The right use of lawful oaths and vows

Of Lawful Oaths and Vows

Section 23.1

A lawful oath is a part of religious worship, wherein the person swearing in truth, righteousness and judgment, solemnly calleth God to witness what he asserteth or promiseth, and to judge him according to the truth or falsehood of what he sweareth.

Of Lawful Oaths and Vows

Section 23.2

The name of God only is that by which men ought to swear, and therein it is to be used with all holy fear and reverence. Therefore to swear vainly, or rashly, by that glorious or dreadful name, or to swear at all by any other thing, is sinful and to be abhorred. Yet as in matters of weight and moment an oath is warranted by the Word of God under the New Testament, as well as under the Old; so a lawful oath, being imposed by lawful authority in such matters, ought to be taken.

Of Lawful Oaths and Vows

Section 23.3

Whosoever taketh an oath, warranted by the Word of God, ought duly to consider the weightiness of so solemn an act, and therein to avouch nothing but what he is fully persuaded is the truth: neither may any man bind himself by oath to any thing, but what is good and just, and what he believeth so to be, and what he is able and resolved to perform. Yet it is a sin to refuse an oath touching any thing that is good and just, being lawfully imposed by authority.

Of Lawful Oaths and Vows

Section 23.4

An oath is to be taken in the plain and common sense of the words, without equivocation or mental reservation. It cannot oblige to sin, but in any thing not sinful, being taken it binds to performance, although to a man's own hurt; nor is it to be violated, although made to heretics or infidels.

Of Lawful Oaths and Vows

Section 23.5

A vow, which is not to be made to any creature, but God alone, is of the like nature with a promissory oath, and ought to be made with the like religious care, and to be performed with the like faithfulness.

Of Lawful Oaths and Vows

Section 23.6

Popish monastical vows of perpetual single life, professed poverty, and regular obedience, are so far from being degrees of higher perfection, that they are superstitious and sinful snares, in which no Christian may entangle himself.