Moreover, he commanded the people, the residents of Jerusalem, to give the portion allotted to the kohanim and the Levites, so that they might devote themselves to the Torah of Adonai.
only considering genealogical records, to the males three years old and upward—to all who entered into the House of Adonai, to perform the daily duties according to their responsibilities and their divisions—
The first of all the firstfruits of everything and every offering of every kind from all your offerings will belong to the kohanim. You will also give the kohen the first of your dough, to make a blessing to rest on your house.
Indeed, those sons of Levi who receive the priesthood have, according to Torah, a command to collect a tithe from the people—that is, from their kin, although they have come out of the loins of Abraham.