וַתַּ֥עַן לָהֶ֖ם מִרְיָ֑ם שִׁ֤ירוּ לַֽיהוָה֙ כִּֽי־גָאֹ֣ה גָּאָ֔ה ס֥וּס וְרֹכְב֖וֹ רָמָ֥ה בַיָּֽם׃ (ס)
And Miriam sang unto them: Sing ye to the LORD, for He is highly exalted: The horse and his rider hath He thrown into the sea.
Read midrashic interpretation of Exodus 15:21: and classical rabbinic exegesis.