'Knees' in the Bible

And it cometh to pass, at Solomon's finishing to pray unto Jehovah all this prayer and supplication, he hath risen from before the altar of Jehovah, from bending on his knees, and his hands spread out to the heavens,

And Ahab goeth up to eat, and to drink, and Elijah hath gone up unto the top of Carmel, and he stretcheth himself out on the earth, and he placeth his face between his knees,

and I have left in Israel seven thousand, all the knees that have not bowed to Baal, and every mouth that hath not kissed him.'