Musar su Isaia 13:78

עמוד התורה . I have already explained that all the levies which the Torah legislates for the benefit of the priests and the Levites are designed to enable their recipients to devote themselves to a life of study and dissemination of Torah. They have been charged by the Torah with teaching Israel the Torah (33,10). The entire universe was created for the sake of Torah. It is significant that the gifts the Torah allocates to the priests and Levites comprise parts of the inert, the vegetable world, the animal kingdom, as well as the firstborn male human beings. They receive certain cities to dwell in, i.e. part of the inert portion of the universe. The tithes represent the vegetable matter, whereas the cheeks, stomachs and thighs of the animals slaughtered for consumption represent their share of the animal kingdom. This is in addition to their receiving the ראשית הגז, the tithes of the firstlings of the shearings. Rabbi Menachem Habavli writes that just as the hairs of the goats are for the goats and the goats dance there (cf. Isaiah 13,21 describing satyrs dancing), so the ראשית הגז is for the priests seeing G–d has chosen them to perform the sacrificial service and to serve as atonement for the sins of the Jewish people referred to by Jeremiah 50,17 as שז פזורה ישראל. The priests even receive a share of the part of the universe called המדבר, i.e. human beings, when they are offered the first-born sons of the other tribes for redemption. The priests are commanded to perform their service in shifts, משמרות, just as the angels in the Celestial Sanctuary perform those duties in rotation.