Chasidut para sa Mga Awit 9:5

This holiday is called the Festival of Shavuot (Weeks) based on the oath (shavuah that they swore and remains, from [the experience] at Mount Sinai. And this is by way of a true sacrifice of the self - as they said, the soul of the Israelites departed. It is like they said (Weekday Siddur, Aleinu), "To You every knee will bend, every tongue will swear" - before a man is created, he is made to take an oath. And likewise when he departs from the world, he sees the Divine Presence, as it were, and is negated to Him, may He be blessed - and that is the oath. And so too was the revelation of, "I am the Lord, your God," at Mount Sinai; and that is why their souls departed. And that is why they are also able to properly accept the yoke of His Kingdom, may He be blessed, today on this festival. And we have already written in another place that the Festival of Pesach and of Shavuot [correspond to] the aspect of the hand tefillin and the head tefillin. The acceptance of the Kingdom of Heaven on Pesach to subjugate the body and the animal spirit is the aspect of the hand tefillin - to subjugate [physical] strength; but on Shavuot, it is the head tefillin. It is as they said (Berakhot 6a:19), "'And all the nations of the earth shall see, etc. the name of the Lord is called upon you' (Deuteronomy 28:10) - this is [a reference to] the head tefillin." It is to subjugate the mind and the intellect to Him, may He be blessed. So too is the order: First one must abnegate himself without complete knowledge; afterwards we merit to know that this is the Torah and the purpose of the three holidays. This is according to the order that our Sages, may their memory be blessed, said (Berakhot 15a:1): One should relieve himself, wash his hands, don tefillin, recite Shema, and pray - this is the complete [acceptance of] the Kingdom of Heaven. So too is the matter more generally of the three holidays and Shemini Atzeret, which is [associated with] the aspect of prayer. That is why the two breads are on Shavuot, as it is stated (Psalms 9:5), "[Wisdom says,] Come, eat my bread." The hand tefillin and the head tefillin [correspond to] the aspect of, "man and beast You deliver, O Lord" (Psalms 36:7). For the hand tefillin [corresponds] to the aspect of the Oral Torah, the arousal of man; and afterwards he merits the flow of knowledge from the Heavens, [corresponding to] the aspect of the Written Torah.