וְהָיָה֩ בַיּ֨וֹם הַה֜וּא יִטְּפ֧וּ הֶהָרִ֣ים עָסִ֗יס וְהַגְּבָעוֹת֙ תֵּלַ֣כְנָה חָלָ֔ב וְכָל־אֲפִיקֵ֥י יְהוּדָ֖ה יֵ֣לְכוּ מָ֑יִם וּמַעְיָ֗ן מִבֵּ֤ית יְהוָה֙ יֵצֵ֔א וְהִשְׁקָ֖ה אֶת־נַ֥חַל הַשִּׁטִּֽים׃
And it shall come to pass in that day, That the mountains shall drop down sweet wine, And the hills shall flow with milk, And all the brooks of Judah shall flow with waters; And a fountain shall come forth of the house of the LORD, And shall water the valley of Shittim.
Rashi on Joel
and water the valley of Shittim—According to its apparent meaning, and it will water the valley of Shittim (Targum), and, according to its Midrashic meaning, He will atone for the iniquity of Peor.