אָ֣ז יָשִֽׁיר־מֹשֶׁה֩ וּבְנֵ֨י יִשְׂרָאֵ֜ל אֶת־הַשִּׁירָ֤ה הַזֹּאת֙ לַֽיהוָ֔ה וַיֹּאמְר֖וּ לֵאמֹ֑ר אָשִׁ֤ירָה לַֽיהוָה֙ כִּֽי־גָאֹ֣ה גָּאָ֔ה ס֥וּס וְרֹכְב֖וֹ רָמָ֥ה בַיָּֽם׃
Then sang Moses and the children of Israel this song unto the LORD, and spoke, saying: I will sing unto the LORD, for He is highly exalted; The horse and his rider hath He thrown into the sea.
Read kabbalistic (mystical) interpretation of Exodus 15:1: and classical mystical sources.