Kabbalah sa Exodo 19:5: Ohr Ne'erav & Kuntres Mattan Torah

Since the divine will desires them, and their will and “clinging” are directed toward Him, these [sefirot] constitute the first level of holiness for [Israel]. Afterwards in this manner [Israel] rises to [the level of] Tiferet, for such is the way from the perspective of His having chosen them. They cling to the Shekhinah, which chooses [them] for its needs and in order to unite herself with her husband, as [Scripture] states, You shall be My own treasure (Exod. 19:5). Afterwards, as they cling to her, they are [also] clinging to Tiferet, as [Scripture] states, You who cleaved to the Lord your God (Deut. 4:4), referring to Tiferet and ‘Ateret.¹⁰‘Ateret is closely connected with Tiferet in the following verses: Isa. 62:3, Jer. 13:18, Prov. 4:9 and 16:31.

26. Know that these matters are clearly apparent to any educated person from the directive that the Holy One, blessed be He, sent to the people of Israel via Moses before receiving the Torah, as said:

“Now therefore, if you will obey my voice indeed, and keep my covenant, then you shall be my own treasure from among all people; for all the earth is mine; and you shall be to me a kingdom of priests and a holy nation. These are the words which you shall speak to the children of Israel. And Moses came and called the elders of the people and laid before them all these words which the Lord had commanded him, and all the people answered together and said, All that the Lord has spoken we will do. And Moses reported the words of the people to the Lord” (Exodus 19:5-8).