'Knee' in the Bible

and he made him to ride in the second chariot which he had. They cried before him, "Bow the knee!" He set him over all the land of Egypt.

I have sworn by myself, the word has gone out of my mouth in righteousness, and will not return, that to me every knee shall bow, every tongue shall take an oath.

But how does God answer him? "I have reserved for myself seven thousand men, who have not bowed the knee to Baal."

For it is written, "'As I live,' says the Lord, 'to me every knee will bow. Every tongue will confess to God.'"

that at the name of Jesus every knee should bow, of those in heaven, those on earth, and those under the earth,