'Knees' in the Bible

The king sent a third captain and his fifty soldiers. This third captain went up and fell on his knees before Elijah. He begged for mercy, "Prophet, please have respect for my life and for the lives of these fifty servants of yours.

Jehu aimed his bow and shot an arrow right between Jehoram's shoulders. The arrow went through his heart and he fell to his knees in his chariot.