'Affirmation' in the Bible

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

but Jesus did so with a sworn affirmation by the one who said to him, "The Lord has sworn and will not change his mind, 'You are a priest forever'" --

For the law appoints as high priests men subject to weakness, but the word of solemn affirmation that came after the law appoints a son made perfect forever.