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.

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.

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.

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.

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.