'Feet' in the Bible

Keep thy feet when thou goest unto a house of God, and draw near to hear rather than to give of fools the sacrifice, for they do not know they do evil.

in the day when the keepers of the house (hands, arms) tremble, and the strong men (feet, knees) bow themselves, and the grinders (molar teeth) cease because they are few, and those (eyes) who look through the windows grow dim;