וַיֵּט֩ מֹשֶׁ֨ה אֶת־יָד֜וֹ עַל־הַיָּ֗ם וַיָּ֨שָׁב הַיָּ֜ם לִפְנ֥וֹת בֹּ֙קֶר֙ לְאֵ֣יתָנ֔וֹ וּמִצְרַ֖יִם נָסִ֣ים לִקְרָאת֑וֹ וַיְנַעֵ֧ר יְהוָ֛ה אֶת־מִצְרַ֖יִם בְּת֥וֹךְ הַיָּֽם׃
摩西向海伸手，天快亮的時候，海水恢復了原來的洶湧之勢；埃及人正迎著海水奔逃，永恆者就在海中把埃及人上下翻攪。
Rashi
לפנות בקר AT THE TURNING OF THE MORNING at the time when the morning turns to come).
Rashbam
ומצרים נסים לקראתו, when they were turning around the wheels of their chariots in order to escape, the waves of the Sea hit them before they had completed their turnaround completely so that at that point it appeared as if they were fleeing in the direction of the onrushing sea. ובני ישראל הלכו ביבשה בתוך הים, all this while the Israelites had already completed crossing the sea while its bed was completely dry.
Sforno
לאיתנו, the waves returning into the trough created by the waters having been split.