'Knees' in the Bible

They struck his head with a reed, and spat on him, and bowing their knees, did homage to him.

But Simon Peter, when he saw it, fell down at Jesus' knees, saying, "Depart from me, for I am a sinful man, Lord."

For this cause, I bow my knees to the Father of our Lord Jesus Christ,

Therefore, lift up the hands that hang down and the feeble knees,