וַיַּנְחֵ֣ם לָ֭בֶטַח וְלֹ֣א פָחָ֑דוּ וְאֶת־א֝וֹיְבֵיהֶ֗ם כִּסָּ֥ה הַיָּֽם׃
And He led them safely, and they feared not; But the sea overwhelmed their enemies.
Read kabbalistic (mystical) interpretation of Psalms 78:53: and classical mystical sources.