Through the Torah, which is called the raishis (beginning, or first), there is a bond of the nation of Yisrael with Hashem, for at the giving of the Torah, there was the revelation of Hashem and His Torah, to the nation of Yisrael.
On Pesach, Hashem revealed His presence and also the firstborn status of the Jewish people, and especially the firstborns of the Jewish people; 50 days later, on Shavuos, there was also this revelation of Hashem, when “Hashem opened all the heavens and showed them Ain Od Milvado,” that there is nothing else besides Him.
At the giving of the Torah, the Creator, Who is the ultimate Raishis (First, or Beginning) was revealed. The Torah, which is also called the raishis, was revealed. The nation of Yisrael is inherently connected to the raishis – to the Torah, and to the ultimate Raishis, Hashem.
This was the kind of d’veykus (connection) that the nation of Yisrael had to Hashem when they stood at Har Sinai.
