1)
How does the phrase "be'Yom Mashcho osam" fit into the Pasuk?
1.
Ramban #1 and Moshav Zekenim #1: It refers to "asher Tzivah Hashem" - 'which Hashem commanded on the day that they were anointed to give to them ... '
2.
Ramban #2 and Moshav Zekenim #2 (citing Ibn Ezra): It refers to "Laseis lahem" - 'which Hashem commanded to give them from 1 the day that they were anointed'.
1
Exchanging the 'Beis for a 'Mem', similar to "veha'Nosar ba'Basar u'va'Lechem" (later, 8:32 [Ramban]).