Why does the Torah repeat the K'lal of all Matnos Kehunah (See also Pasuk 8)?
Rashi: Because the Parshah of Matnos Kehunah is dear to Hashem, He begins it with a K'lal and ends it with a K'lal, placing the P'rat (the details) in the middle.
Seforno: "Kol T'rumos ha'Kodashim" actually comes to include what the owner separates from the Lachmei Todah, 1 the Sh'tei ha'Lechem and Chalah.
Refer also to 18:11:1:1*.
What is the significance of "B'ris Melach ... "?
Rashi #1: Hashem made a covenant with Aharon, on something that is healthy and that lasts, and that makes other food 'healthy'.
Rashi #2: It means that, like the covenant that Hashem made with salt - it never goes bad.
Rashi #3 (in Chulin, 133b) and Targum Yonasan: It means that like the covenant with salt, the covenant with Aharon will never cease. 1
Rashbam: It means a covenant that lasts for all generations.
Targum Yonasan: And salt sweetens the meat of the Korbanos. See also Oznayim la'Torah DH 'B'ris Melach #1 & #2.