'Oath' in the Bible

And when a person doth sin, and hath heard the voice of an oath, and he is witness, or hath seen, or hath known -- if he declare not, then he hath borne his iniquity:

Or if a soul swear, pronouncing with his lips to do evil, or to do good, whatsoever it be that a man shall pronounce with an oath, and it be hid from him; when he knoweth of it, then he shall be guilty in one of these.

if he has found something that had been lost and then lied about it, or if he makes a false oath about any of these things, thus committing a sin with respect to these things.

or the thing about which he had given a false oath. He is to restore it in full, add a fifth to it, then give it to whom it belongs the very day he's found guilty.

But if his offering is made because of an oath or given freely, it may be taken as food on the day when it is offered; and the rest may be used up on the day after:

And do not take an oath in my name falsely, putting shame on the name of your God: I am the Lord.

Say to Aaron and to his sons and to all the children of Israel, If any man of the children of Israel, or of another nation living in Israel, makes an offering, given because of an oath or freely given to the Lord for a burned offering;

And whoever makes a peace-offering to the Lord, in payment of an oath or as a free offering, from the herd or the flock, if it is to be pleasing to the Lord, let it be free from any mark or damage.

An ox or a lamb which has more or less than its natural parts, may be given as a free offering; but it will not be taken in payment of an oath.

Say to the children of Israel, If a man makes a special oath, you will give your decision as to the value of the persons for the Lord.

But the field, when it becomes free at the year of Jubilee, will be holy to the Lord, as a field given under oath: it will be the property of the priest.

But a man may not give by oath to the Lord the first-fruits of cattle which are offered to the Lord: if it is an ox or a sheep it is the Lord's.