English: “You have been shown to know” — when the Holy One, blessed be He, gave the Torah He opened for them seven firmaments; just as He split the upper realms so He split the lower, and they saw that He alone is One.
In context: The uniqueness of the Sinai event is not only auditory but also a momentary unveiling of the cosmos that leaves no room for any other deity.
Type of Learning
Custom (aggadic expansion of “atah horeita”).
What Is Learned
Israel was shown, not merely told, that Hashem alone is God; the revelation left no possibility of another power.