הָ֤פַךְ יָ֨ם ׀ לְֽיַבָּשָׁ֗ה בַּ֭נָּהָר יַֽעַבְר֣וּ בְרָ֑גֶל שָׁ֝֗ם נִשְׂמְחָה־בּֽוֹ׃
He turned the sea into dry land; They went through the river on foot; There let us rejoice in Him!
Read kabbalistic (mystical) interpretation of Psalms 66:6: and classical mystical sources.