What exactly is the meaning of the words "ve'ha'Nosar ba'Basar u'va'Lachem"?
Ramban: It means "Whatever is leftover from the Basar and from the bread" - as if it had written "mi'Basar u'mi'Lachem" (with a 'Mem'). 1
Why does the Torah not write "ve'ha'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: Because the Torah wrote in Shemos (29:34), by the command "V'Im Yivaser mi'Besar ha'Milu'im u'min ha'Lechem ad ha'Boker, Vesarafta es ha'Nosar ba'Eish ... ".