Musar su Ezechiele 44:30

Both the commandment of ציצית and that of חלה, are described as ראשית , "heads." In the case of חלה, the Torah speaks about מראשית עריסותיכם, that it is to be taken "from the first part of your doughs" (15,21). Bereshit Rabbah explains that word as meaning "on account of the Challah." The Rekanati describes the mystical dimension of this commandment as being the fact that Israel the nation is called ראשית relative to other nations. This does not only mean that Israel is first, but also that Israel is separate from other nations. It is necessary when putting the dough inside the oven to separate the חלה from the flames of the oven so as not to confront the מדת הדין הקשה, the attribute of Justice in its greatest intensity. This is the meaning of the expression תרומה לה', i.e. a gift to the attribute of Mercy which is mentioned in 15,21. This is the deeper meaning of the statement in the Midrash i.e. "בראשית" on account of that gift which is called ראשחץ. Blessing devolves upon the world because of the fulfillment of this commandment. The reason the חלה is to be given to the כהן is so that blessing will come to rest on your houses. Thus far the Rekanati.