Why does the Torah repeat this Pasuk, which was already said in Shemos (29:38)?
Rashi: The Pasuk in Shemos was said exclusively with regard to the Shiv'as Yemei ha'Milu'im, 1 whereas the current Pasuk applies to future generations.
Ramban: It repeats it here in order to incorporate all the Korbanos in one location together with those that it has not previously mentioned. 2
Why does the Torah write "ha'Keves Echad" and not 'Keves ha'Echad' (as it said in Shemos, 29:38)?
Ramban (on Pasuk 2) and R. Bachye: To teach the Kohanim to bring the Nesachim in the Name of Hashem Echad 1 and not for any other motive.
R. Bachye: As if the Torah had written 'Es ha'Keves shel Echad'. Moreover, "Echad", whose Gematriyah is thirteen, also hints at the number of Kohanim who participated in the Korban Tamid.
Why is it necessary to bring two Korbanos Tamid daily? Why will one not suffice?
Bamidbar Rabah 21:21, Targum Yonasan: The morning Tamid comes to atone for sins committed in the night and the afternoon Tamid, for sins committed during the day. 1
See Peirush Yonasan.
Rashi writes that the Pasuk in Shemos was only for the Milu'im, It says (Shemos 29:42) "l'Doroseichem"!
Refer to 28:4:1:2.
Moshav Zekenim: Perhaps we hold like R. Eliezer (Chagigah 6b), who says that the Torah commanded about the Tamid at Sinai, but we did not offer it until Dor ha'Midbar died out 1 , for they were excommunicated.
I.e. the command was repeated now, after Dor ha'Midbar died out, to teach that now that they should offer it. (PF)