Refer to 22:7:0.2:1.

Sifra: To compare the Tevilah to sunset (nightfall), inasmuch as, like sunset, it must be performed in one go, and not a limb at a time.

Rashi #1 (on Pasuk 4): It means that the day has come to an end ¹ - which the Gemara in Berachos, 2b, learns from the fact that the Torah does not write "Veyithar".

Rashi (in Sotah, 29b): "Vetaher" implies that, extrapolates from the word "Vetaher" that, until now (whilst he was a Tevul-Yom), he was Tamei.

Targum Onkelos and Targum Yonasan: It means that he is Tahor from being a T'vul-Yom and is permitted to eat Terumah. ²

Rashi (in Sotah, 29b): Because, in spite of the Tevilah, ¹ until nightfall he remains a T'vul-Yom (who has the Din of a Sheini le'Tum'ah).

Rashi: It precludes Kodshei Mizbe'ach ¹ from the Heter of eating Terumah ² already at nightfall. ³

Yerushalmi Bikurim 2:1: "Kodashim" implies Kodashim Tehorim - implying that a Tahor who eats Kodashim Teme'im transgresses an Aseh. ¹

Yerushalmi Orlah 2:1 #2: "Min ha'Kodashim" implies that if a Sa'ah of Kodesh fell into less than a hundred Sa'ah of Terumah, a Mechusar Kipurim is forbidden to eat it - and the same applies if food or drink of Terumah fall into Chulin, or vice-versa.

Seforno: To teach us that reason the Torah allows the Kohen to eat Terumah immediately after nightfall and does not require him to wait until he brings his Korban the next day, is because Terumah is the Kohen's staple diet. ¹

Sifra: To teach us that the Kohen may eat wheat of Terumah in any way that he wants and make holes in vegetables of Terumah as he pleases. ²

Sifra: To incorporate the trimmings of vegetables of Terumah in the Din of Terumah - which therefore retain their Kedushah. ³

Moshav Zekenim (citing Yevamos 74b): That Pasuk is referring to Ma'aser Sheini, which the Torah also refers to as Kodshim. ¹