Proverbs 30:15-16 (New International Version)

 ¹⁵ "The leech has two daughters.
       'Give! Give!' they cry.
       "There are three things that are never satisfied,
       four that never say, 'Enough!':

 ¹⁶ the grave, ^[a] the barren womb,
       land, which is never satisfied with water,
       and fire, which never says, 'Enough!'