Ezek 47:1

וַיְשִׁבֵנִי֮ אֶל־פֶּ֣תַח הַבַּיִת֒ וְהִנֵּה־מַ֣יִם יֹצְאִ֗ים מִתַּ֨חַת מִפְתַּ֤ן הַבַּ֨יִת֙ קָדִ֔ימָה כִּֽי־פְנֵ֥י הַבַּ֖יִת קָדִ֑ים וְהַמַּ֣יִם יֹרְדִ֗ים מִתַּ֜חַת מִכֶּ֤תֶף הַבַּ֨יִת֙ הַיְמָנִ֔ית מִנֶּ֖גֶב לַמִּזְבֵּֽחַ׃

Then the man brought me back to the entrance of the temple, and I saw water flowing from under the threshold of the temple toward the east (for the temple faced east). The water was coming down from under the south side of the temple, south of the altar.