Moreover he commanded the people who lived in Yerushalayim to give the portion of the Kohanim and the Levites, that they might give themselves to the law of the LORD.
besides those who were reckoned by genealogy of males, from three years old and upward, even everyone who entered into the house of the LORD, as the duty of every day required, for their service in their offices according to their divisions;
The first of all the first fruits of every thing, and every offering of everything, of all your offerings, shall be for the Kohen: you shall also give to the Kohanim the first of your dough, to cause a blessing to rest on your house.
They indeed of the sons of Levi who receive the Kohen's office have a mitzvah to take tithes of the people according to the Torah, that is, of their brothers, though these have come out of the body of Avraham,