Having said "Sh'nei ha'Omer la'Echad", what does the Torah mean by adding "Lechem Mishneh"?
Rashi: It means that its taste was special too. 1
See Da'as Zekeinim mi'Ba'alei Tosfos, who learns from "Sh'nei ha'Omer la'Echad", that the portion of Manna doubled on Shabbos, so that they had two loaves of bread for each meal, instead of the usual one.
Why were people surprised when on Friday, they found that they had collected two Omers per person, seeing as Hashem had already informed them (in Pasuk 5) that this would occur?