Midras Bilangan 5:9: Sifrei Bamidbar & Bamidbar Rabbah

(Bamidbar 5:9) "And all terumah of all the holy things of the children of Israel which they present to the Cohein, to him shall it be." R. Yishmael says: Scripture comes to teach you that if one dedicates (to the Temple) his grain pile before he levels it off and then he redeems it, he must take terumah (from it). I might think (he must do so) even if he redeemed it after he leveled the pile; it is, therefore, written (of terumah, Devarim 18:4) "the first of your corn (pile)." R. Akiva says: "and all terumah": Scripture comes to teach you that if he wishes to make his entire granary terumah, he may do so, so long as he leaves some over. "and all terumah of all the holy things": Scripture hereby teaches us that the laws of terumah apply to all varieties (of produce, and not just to those specifically indicated). Issi b. Yehudah says: If the ma'aser — the less stringent — obtains with all produce, how much more so, terumah — the more stringent. Variantly: If ma'aser, which does not obtain in the third and sixth year (of shemitah), obtains with all produce, how much more so, terumah, which obtains in all years! Issi b. Menachem says: if ma'aser, which is brought only as an adjunct to learning and fear (viz. Devarim 14:23), obtains with all produce, how much more so, the more stringent, terumah! (Ibid. 5:9) "which they offer to the Cohein, to him shall it be": R. Yishmael says: Now is terumah offered to the Cohein? (Does he not rather come to receive it?) What, then, is the intent of "which they offer to the Cohein"? Because it is written (Shemot 23:19) "The first of the first-fruits (bikkurim) of your land shall you bring to the house of the L-rd your G-d," but we are not told what is to be done with them; it is, therefore, written "which they offer to the Cohein, to him shall it be." Scripture hereby teaches us that bikkurim, (which are presented as offerings), are to be given to the Cohanim.

“Every gift of all the sacred items of the children of Israel that they will present to the priest shall be his” (Numbers 5:9).
“Every gift [teruma]” – the verse tells regarding teruma that it is in effect regarding everything.⁴²Meaning, everything that grows from the ground.
“Of all the sacred items of the children of Israel” – this includes other unspecified sacred items that are not explicitly mentioned here, that they go to the priests, and no part of them is for the Lord, just as it is stated: “That is returned” (Numbers 5:8), regarding robbery from a proselyte.⁴³The robbery from a proselyte is given in its entirety to the priests. I wonder, what else do I include? Ḥalla, dedications, hides, firstborns, redemption of the firstborn son, and redemption of a firstborn donkey.
“That they will present” – Rabbi Yishmael said: Does one sacrifice [makrivin] teruma? Why does the verse state: “That they will present [yakrivu]”?⁴⁴Yakrivu can also mean, “they will sacrifice.” The midrash is asking why the verse uses the word “sacrifice” with regard to teruma. Because it says: “The choicest first fruits [of your land you shall bring to the house of the Lord your God]” (Exodus 23:19), but we did not hear what shall be done with them. The verse states: “That they will present to the priest, shall be his” – the verse comes and teaches regarding first fruits that they are given in their entirety to the priests.

Another matter: “A man who gives to the priest, it shall be his” – what is written before it? “Every gift of all the sacred items of the children of Israel [that they will present to the priest shall be his]” (Numbers 5:9). The Holy One blessed be He said: Anyone who gives teruma and consecrated items to the priest properly, he will be privileged to marry his daughters into the priesthood, and his descendants will partake of consecrated items. In this regard, it is stated: “A man’s sacred items shall be his,” as his descendants will partake of consecrated items due to the merit of the teruma, tithes, and consecrated items that he generously gave to the priest.