Ezekiel 47:1-2

Then the shining man brought me back to the entrance of the temple, and I saw water flowing from underneath the temple threshold. It was flowing eastward (for the temple faced east). Water was trickling out from the south side of the temple, south of the altar. Then he took me out by the north gate and led me around the outside to the gate that faces east. And there I saw water flowing out on the right-hand side, south of the gateway.