"And Hashem took us out of Egypt with a strong hand and with an outstretched arm and with great awe, and with signs and with wonders" (Deuteronomy 26:8).
"And Hashem took us out of Egypt" - Not through an angel and not through a seraph and not through a messenger, but [directly] the Holy One, blessed be He, Himself, as it is stated (Exodus 12:12); "And I will pass through the Land of Egypt on that night, and I will smite every firstborn in the Land of Egypt, from men to animals; and against all the gods of Egypt, I shall make judgments, I am Hashem." 'And I will pass through the Land of Egypt' - I and not an angel. 'And I will smite every firstborn' - I and not a seraph. 'And against all the gods of Egypt, I will make judgments" - I and not a messenger. 'I am Hashem' - I am He, and none other.