מַרְכְּבֹ֥ת פַּרְעֹ֛ה וְחֵיל֖וֹ יָרָ֣ה בַיָּ֑ם וּמִבְחַ֥ר שָֽׁלִשָׁ֖יו טֻבְּע֥וּ בְיַם־סֽוּף׃
Pharaoh’s chariots and his host hath He cast into the sea, And his chosen captains are sunk in the Red Sea.
Rashi on Exodus
ירה בים Onkelos translates this by שדי בימא: HE HATH CAST IN THE SEA. The word שדי is an expression for “casting”. And thus, also, it says, (Exodus 19:13) או ירה יירה which Onkelos renders by או אשתדאה ישתדי “or he shall certainly be thrown down” where the ת is used in both these words in place of (as marking) the Ithpael form, so that in these Targum words the root is שדי.
Sforno on Exodus
מרכבות פרעה וחילו, after giving thanks to G’d for the destruction of Pharaoh and his horse, Moses refers to G’d’s fight against the army and his elite corps of officers which constituted the backbone of his army.
Rashbam on Exodus
ירה בים, the verb is a variation of זרק or השליך, meaning: “he threw, flung with force.” It is used as such an alternate in Samuel II 11,24.