'Sworn' in the Bible

Again, ye have heard that it has been said to the ancients, Thou shalt not forswear thyself, but shalt render to the Lord what thou hast sworn.

Therefore being a prophet, and knowing that God had sworn with an oath to him, that of the fruit of his loins, according to the flesh, he would raise up Christ to sit on his throne;

But when the time of the promise drew nigh, which God had sworn to Abraham, the people grew and multiplied in Egypt,

For we which have believed do enter into rest, as he said, As I have sworn in my wrath, if they shall enter into my rest: although the works were finished from the foundation of the world.

And since this was not done without a sworn affirmation -- for the others have become priests without a sworn affirmation,

but He became a priest with an oath made by the One who said to Him:The Lord has sworn,and He will not change His mind,You are a priest forever.