"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."