We've been talking about how the belief in Hashem Echad/ the Oneness of Hashem is part and parcel of our Bitachon. In Sefer Hachinuch Mitzvah 417, he talks about the mitzvah of the belief of Hashem Echad, and says that we're commanded to believe that Hashem is the only One that brought any existence into being, and He is the Boss without any partnerships, as it says Shema Yisrael, Hashem Elokenu Hashem Echad This belief is a positive commandment. He says, The one that believes and relies on Him will be protected in a fortress. Rav Bloch points out that the Sefer HaChinuch brings Bitachon down in relation to Hashem Echad, so we see clearly that the source of Bitachon is this concept of belief in En Od Milevado.
Furthermore, the Rosh, in his sefer Orchot Chaim (letter 26) talks about Bitachon and says that it means to rely on Hashem with all your heart, and to believe in His individual supervision, which is called yichud hashalem. So here again, we see that Bitachon is a fulfillment of the complete Oneness, by believing that Hashem’s eyes are everywhere, that He's watching and checking on us, and getting into our inner thoughts.
And he adds a famous line: One who does not believe in the lessons of Yetziat Mitzrayim does not believe in God.
What does that mean? He explains that we say Anochi Hashem Elokecha, Asher Hotzeticha M’Eretz Mitzrayim/ I am Hashem your God, that took you out of Egypt. But if you don't believe in the lessons of being taken out of Egypt, which are lessons of God's Divine supervision over every individual (which we call Hashgacha Pratit), then you don't believe in the God of the Jewish people. Because when God introduces himself as, “I am Hashem your God,” He says, with that, “that took you out of Mitzrayim.”
So I am Hashem your God brings with it the belief in Hashem's power and control over every detail, which is the Oneness. That's why the Rosh says, If you don't have that belief, you do not have a complete belief in Hashem’s Echad. Because Hashem is Echad means there is nothing else but Him. How can He not be in control of every detail, if there's nothing else but Him? He says that this is what separates the Jewish people from the rest of the world and their beliefs.
He ends with a powerful statement, “This is the Yesod/ Foundation of the entire Torah. The foundation of the entire Torah is the opening statement of the 10 commandments:
Anochi Hashem Elokecha, I am Hashem your God
It’s not enough just to believe Hashem is your God, but also that,
Asher Hotzeticha M’Eretz Mitzrayim/ that took you out of Egypt.
That means believing that when they put out the glass of water, for the Jew it was water but for the goy it was blood.
How could that be?
It’s because Hashem was differentiating between every glass of water. It's water because God decides water for you. And if He doesn't decide it's water for you, then it’s not water for you. So too, God was able to differentiate a firstborn from a non-firstborn.
All of these details and lessons of Yetziat Mitzrayim are part of the belief in Hashem Echad, which is the source of our bitachon.
The source of our bitachon comes from our belief in Hashem Echad.