'Knees' in the Bible

And again he sent the captain of a third fifty with his fifty. And the third captain of fifty went up, and came and fell on his knees before Elijah, and besought him, and said unto him, O man of God, I pray thee, let my life, and the life of these fifty thy servants, be precious in thy sight.

And when he had taken him, and brought him to his mother, he sat on her knees till noon, and then died.