Bamidbar 18:19

19 All the terumot hakodashim, which the Bnei Yisroel offer unto Hashem, have I given thee, and thy banim and thy banot with thee, by a chok olam; it is a brit melach olam before Hashem unto thee and to thy zera with thee.

Bamidbar 18:19 Meaning and Commentary

Numbers 18:19

All the heave offerings of the holy things
All before mentioned, and whatsoever comes under that name:

which the children of Israel offer unto the Lord;
either by his commandment, or of their own freewill;

have I given thee, and thy sons, and thy daughters with thee, by a
statute for ever:
so providing for their maintenance by an irrepealable law as long as their priesthood lasted, even until the Messiah should come:

it [is] a covenant of salt for ever before the Lord unto thee, and thy
seed with thee:
an incorruptible, inviolable, durable covenant, which should last for ever, even until the Gospel dispensation or world to come should take place; and it would remain ever before the Lord in his sight, who would take care it should never be made void, but stand fast with Aaron and his posterity as long as his priesthood endured.

Bamidbar 18:19 In-Context

17 But the bechor of a cow, or the bechor of a sheep, or the bechor of a goat, thou shalt not redeem; they are kodesh; thou shalt sprinkle their dahm upon the Mizbe’ach, and shalt burn their fat for an offering made by eish, for a re’ach nichoach unto Hashem.

18 And the basar of them shall be thine, like the breast of the tenufah and like the right thigh are thine.

19 All the terumot hakodashim, which the Bnei Yisroel offer unto Hashem, have I given thee, and thy banim and thy banot with thee, by a chok olam; it is a brit melach olam before Hashem unto thee and to thy zera with thee.

20 And Hashem spoke unto Aharon, Thou shalt have no nachalah in their land, neither shalt thou have any chelek among them; I am thy chelek and thine nachalah among the Bnei Yisroel.

21 And, hinei, I have given the Bnei Levi all the ma’aser (tithe) in Yisroel for a nachalah, for their Avodah which they serve, even the Avodat Ohel Mo’ed.