What is the definition of "Mele'ascha" and "Dim'acha"?
Ramban #1: "Mele'ascha refers to corn and to wine and oil, 3 with which one fills up the storehouses
Taken from grain which the Torah calls 'Mele'ah' in Devarim 22:9 (Ramban and Rashbam). Rashi, Riva and Rosh - it is an obligation that comes when your grain is full and ripens - Bikurim.
Ramban: So-called because it is brought from wine and oil, rather then from grapes and olives. Rosh - it is something that drips and is clear, like tears - Terumah of wine and oil.
Ramban: 'Dim'ah' defines anything that drips, not only tears. The Ramban (in this explanation) does not clarify whether this applies to Bikurim or to Terumah.
What is an Isur of delaying females?! Perhaps he means that in the merit of giving the Bechor to Me, you will not delay to be blessed with sons and daughters. (PF)
What are the connotations of "Lo Te'acher"?
Rashi (citing the Mechilta) and Ramban #2 (citing the Mishnah in T'rumos, 3:7: It is a prohibition against changing the order of Matanos
See Ramban DH 've'Al Da'as Raboseinu', who cites the reasons for the order of priorities.
What does "B'chor Banecha Titen Li" entail?
Rashi: It entails redeeming one's firstborn son from a Kohen for five Sela'im. 1
Seforno: It entails serving in the Beis-ha'Mikdash and to study (and teach Torah). 2
Targum Onkelos and Targum Yonasan: It entails designating them for Hashem.
Having already taught the Din of B'chor Adam in Sh'mos 13:13, why does the Torah see fit to repeat it here?
Rashi: In order to juxtapose the Din of B'chor Beheimah to that of B'chor Adam - inasmuch as, just as one redeems a firstborn baby after thirty days, so too, should one hold on to a B'chor Beheimah for seven days before giving it to a Kohen. 1
Seforno: Just as one gives a B'chor Adam to Hashem when it has left the realm of Safek Nefel (after thirty days), so too, must one give a B'chor Beheimah to Hashem when it has left the realm of Safek Nefel (after eight days).
Rashbam: Refer to 22:28:5:1.
QUESTIONS ON RASHI
Rashi writes that Dema is Terumah. What is the source?
Moshav Zekenim: Dema is an expression of a liquid - "va'Tashkemo bi'Dma'os Shelish." Since the verse warns about Terumah, it used an expression of a liquid, like it says [about Terumah] "Kol Chelev Yitzhar v'Chol Chelev Tirosh." It does not say 'Chelev Zayis v'Chelev Anavim'! However, Bikurim cannot be called Dema, for one brings Peros, and not liquid. 1
Riva citing R"M of Pontaiza: Most Terumah is called a liquid. (I.e. two of the three kinds from which the Torah obligated Terumah; only grain is not. Terumos 11:3 - one may give Terumah of wine or oil, but all other species are given without changing them). Most Bikurim may not be liquids - "Tavi" permits bringing liquids only from grapes and olives.