'Swear' in the Bible

By Myself I have sworn, Gone out from my mouth in righteousness hath a word, And it turneth not back, That to Me, bow doth every knee, every tongue swear.

So that he who is blessing himself in the earth, Doth bless himself In the God of faithfulness, And he who is swearing in the earth, Doth swear by the God of faithfulness, Because the former distresses have been forgotten, And because they have been hid from Mine eyes.