'Swear' in the Bible

At that time, there will be five cities in the land of Egypt that speak the language of Canaan and swear allegiance to the LORD of the Heavenly Armies. One of them will be called the City of the Sun.

By myself I have sworn from my mouth has gone out integrity, a promise that won't be revoked: "To me every knee will bow, and every tongue will swear.'

"Listen to this, house of Jacob, you who are called by the name of Israel, and who have come forth from Judah's loins; you who swear oaths in the name of the LORD and invoke the God of Israel but not in truth, nor in good faith.

Then whoever takes an oath by the God of faithfulness, and whoever takes an oath in the land, will swear by the God of faithfulness, because the former troubles are forgotten and are hidden from my eyes.