What exactly is the meaning of the words "veha'Nosar ba'Basar u'va'Lachem"?
Ramban, Moshav Zekenim: It means "Whatever is leftover from the meat and from the bread" - as if it had written "Min ha'Basar u'Min ha'Lachem". 1
Why does the Torah not write '[veha'Nosar] Ad ha'Boker]'?
Ramban #1: Because they already knew that the Shelamim of the Milu'im had the stringencies of Kodshei Kodshim - which may only be eaten for a day and a night, and which become Nosar on the following morning.
Ramban #2: The Torah already wrote in Shemos (29:34), in the command "V'Im Yivaser mi'Besar ha'Milu'im u'min ha'Lechem ad ha'Boker, Vesarafta Es ha'Nosar ba'Eish ... ".
Rashi (verse 2) writes that this was seven days before the Mishkan was erected. How can this be? It says "Pesach Ohel Mo'ed"!
Rosh, Ramban (2), Moshav Zekenim (2), Hadar Zekenim (7), Starting on the 23rd, Moshe erected the Mishkan each day and dissembled it. 1 On Rosh Chodesh Nisan, he erected it and left it standing.
Rosh: He erected it each morning, and dissembled it towards evening. (Verse 35 obligates them to stay in Pesach Ohel Mo'ed day and night! We must say that it means the place of Ohel Mo'ed, even though at night it was dissembled. - PF)