"Drink water from your own cistern, flowing water from your own well." (The Book of Proverbs 5:15)
"But Rabshakeh said, Hath my master sent me to thy master and to thee to speak these words? hath he not sent me to the men that sit upon the wall, that they may eat their own dung, and drink their own piss with you?" (Isaiah 36:12) (See also 2 Kings 18:27)