יואל ד:יח פירוש: רש״י

springs Heb. אֲפִיקֵי, a place of the source of water.

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.