What are the implications of "v'Samu Es Sh'mi"?
Rashi (from Sifri): It implies that the Kohanim should bless Yisrael with the Shem ha'Meforash. 1
Moshav Zekeinim citing Yerushalmi (Gitin 5:9): Do not say 'a Kohen who transgresses Arayos and murder 2 blesses me?!' I (Hashem) bless you, and not him!
What are the implications of "va'Ani Avarachem"?
Rashi #1, Targum Onkelos and Targum Yonasan: It implies that Hashem will bless Yisrael. 1
Rashi #2: It implies that (when the Kohanim bless Yisrael) Hashem will bless the Kohanim.
QUESTIONS ON RASHI
Rashi writes that they bless with Shem ha'Mefurash. What is this, and where is this done?
R. Bechayei: It is Hashem's 12-letter name, which contains His four-letter name three times, with different Nekudos.
Gevuras Ari (Yuma 66a, citing Rav Hai Gaon): It is Hashem's 42-letter name.
Tosfos Yom Tov (Yuma 6:2, citing RaMaK) - people fell down only when the Kohen Gadol said Shem ha'Mefurash in Avodas Yom Kipur. Perhaps at all other times it was said with the Nekudos of Shem Aleph-Dalet.