English: When the Holy One, Blessed be He, came to redeem Israel, He did not send a messenger or an angel, but He Himself, as it is written, “And I will pass through the land of Egypt” — He and all His retinue.
Type of Learning
Emphasis on first-person agency: redemption and the plague were by Hashem Himself.
What Is Learned
The plague of the firstborn was carried out by Hashem Himself, not by an intermediary.