Ezekiel 47:1-2

Now he brought me back to the entrance to the Temple. I saw water pouring out from under the Temple porch to the east (the Temple faced east). The water poured from the south side of the Temple, south of the altar. He then took me out through the north gate and led me around the outside to the gate complex on the east. The water was gushing from under the south front of the Temple.