'Oath' in the Bible

Whereupon he promised with an oath to give her whatsoever she should ask.

And again he denied with an oath, I know not the man.

The oath which he spake unto Abraham our father,

Being therefore a prophet, and knowing that God had sworn with an oath to him, that of the fruit of his loins he would set one upon his throne;

For men swear by the greater: and in every dispute of theirs the oath is final for confirmation.

Wherein God, being minded to show more abundantly unto the heirs of the promise the immutability of his counsel, interposed with an oath;

And inasmuch as it is not without the taking of an oath

(for they indeed have been made priests without an oath; but he with an oath by him that saith of him, The Lord sware and will not repent himself, Thou art a priest for ever);

For the law appointeth men high priests, having infirmity; but the word of the oath, which was after the law, appointeth a Son, perfected for evermore.

But above all things, my brethren, swear not, neither by the heaven, nor by the earth, nor by any other oath: but let your yea be yea, and your nay, nay; that ye fall not under judgment.