Psalms 46:4 Midrash

יֶהֱמ֣וּ יֶחְמְר֣וּ מֵימָ֑יו יִֽרְעֲשֽׁוּ־הָרִ֖ים בְּגַאֲוָת֣וֹ סֶֽלָה׃

Though the waters thereof roar and foam, Though the mountains shake at the swelling thereof. Selah

Read midrashic interpretation of Psalms 46:4: and classical rabbinic exegesis.