Midras Keluaran 14:9: Mekhilta DeRabbi Yishmael, Shir HaShirim Rabbah, Midrash Tanchuma & Midrash Tanchuma Buber

"a horse and its rider": The Holy One Blessed be He brings horse and rider, stands them in judgment, and says to the horse: Why did you pursue My children? The horse: An Egyptian spurred me on against my will, viz. (Ibid. 14:23) "And Egypt pursued, etc." The L–rd to Egypt: Why did you pursue My children? The Egyptian: The horse spurred me on against my will, viz. (Ibid. 15:19) "When the horse of Pharaoh came with its chariot and its riders, etc." What does the L–rd do? He mounts the man of the horse and judges both of them together, viz. "a horse and its rider He cast into the sea."

(Exodus 14:9) "And Egypt pursued them" (This is ostensibly redundant.) We are hereby apprised that not one of them stumbled on the way, lest they resort to divination and turn back.

“I have likened you [dimitikh], my love,” Rabbi Eliezer said: [This is analogous] to a princess who was taken captive and her father was about to redeem her. She was motioning to her captors and saying to them: ‘I am for you, I am yours, and I will follow you.’²⁵⁰She said this out of fear of what they might do to her if her father was unable to redeem her. Her father said to her: ‘Do you believe that I do not have the wherewithal to redeem you? I am silencing you [duma dimitikh], be silent.’ So too, when the Israelites were encamped at the sea: “Egypt pursued them and overtook them encamped by the sea” (Exodus 14:9). The Israelites, in their fear, were motioning to the Egyptians and saying to them: ‘We are for you, we are yours, and we will follow you.’ The Holy One blessed be He said to them: ‘Do you believe that I do not have the wherewithal to redeem you? I am silencing you [duma dimitikh], I have silenced you.’ That is what is written: “The Lord will wage war for you and you shall be silent” (Exodus 14:14).